diff --git a/actions/services/documentDirectService.js b/actions/services/documentDirectService.js
index d0afabb8..4934576a 100644
--- a/actions/services/documentDirectService.js
+++ b/actions/services/documentDirectService.js
@@ -92,11 +92,13 @@ export const deleteAwaitingSubmissionsFromBlob = (
         "&casefolderID=" +
         casefolderID;
 
-    var config = {
-        method: "get",
-        url: queryUrl + hashAPIPath(queryUrl)
-    };
-    return axios(config)
+    return buildHashedQueryUrl(queryUrl)
+        .then((signedUrl) =>
+            axios({
+                method: "get",
+                url: signedUrl
+            })
+        )
         .then((res) => {
             return res.data;
         })
@@ -118,11 +120,13 @@ export const deleteMyRepresentationsFromBlob = (
         "&repfile=" +
         repfile;
 
-    var config = {
-        method: "get",
-        url: queryUrl + hashAPIPath(queryUrl)
-    };
-    return axios(config)
+    return buildHashedQueryUrl(queryUrl)
+        .then((signedUrl) =>
+            axios({
+                method: "get",
+                url: signedUrl
+            })
+        )
         .then((res) => {
             return res.data;
         })
diff --git a/actions/services/portalDirectService.js b/actions/services/portalDirectService.js
index 9bf17190..1e112810 100644
--- a/actions/services/portalDirectService.js
+++ b/actions/services/portalDirectService.js
@@ -182,19 +182,21 @@ export const deleteMyRepresentations = (myRepresentationsID) => {
         "/api/endpoint/deletemyrepresentations_api?myRepresentationsID=" +
         myRepresentationsID;
 
-    var config = {
-        method: "delete",
-        url: queryUrl + hashAPIPath(queryUrl),
-        headers: {
-            "OData-MaxVersion": "4.0",
-            "OData-Version": "4.0",
-            "Accept": "application/json;odata.metadata=none",
-            "Prefer": 'odata.include-annotations="*",return=representation',
-            "Content-Type": "application/json"
-        }
-    };
-
-    return axios(config)
+    return buildHashedQueryUrl(queryUrl)
+        .then((signedUrl) =>
+            axios({
+                method: "delete",
+                url: signedUrl,
+                headers: {
+                    "OData-MaxVersion": "4.0",
+                    "OData-Version": "4.0",
+                    "Accept": "application/json;odata.metadata=none",
+                    "Prefer":
+                        'odata.include-annotations="*",return=representation',
+                    "Content-Type": "application/json"
+                }
+            })
+        )
         .then((res) => {
             return res.data;
         })
@@ -224,17 +226,20 @@ export const deleteAwaitingSubmissions = (incidentID) => {
 export const deleteWatchedCases = async (watchedCaseID) => {
     var queryUrl =
         "/api/endpoint/deletewatchedcases_api?watchedCaseID=" + watchedCaseID;
-    var config = {
-        method: "delete",
-        url: queryUrl
-    };
 
-    try {
-        const res = await axios(config);
-        return res.data;
-    } catch (error) {
-        consoleLogger(error);
-    }
+    return buildHashedQueryUrl(queryUrl)
+        .then((signedUrl) =>
+            axios({
+                method: "delete",
+                url: signedUrl
+            })
+        )
+        .then((res) => {
+            return res.data;
+        })
+        .catch((error) => {
+            consoleLogger(error);
+        });
 };
 
 export const sendCaseCompleteMessage = async (
diff --git a/components/myportal/topthree_reps.js b/components/myportal/topthree_reps.js
index ea1a2169..0a52ac96 100644
--- a/components/myportal/topthree_reps.js
+++ b/components/myportal/topthree_reps.js
@@ -273,8 +273,7 @@ const TopThree = (props) => {
                                             deleteRepItem(
                                                 props.accountDetails
                                                     .containerID,
-                                                showTopThreeArr[key]
-                                                    .ticketnumber,
+                                                showTopThreeArr[key].caseRef,
                                                 showTopThreeArr[key]
                                                     .repfile_name
                                             );
diff --git a/components/myportal/viewall.js b/components/myportal/viewall.js
index 1885c7ea..6532be5a 100644
--- a/components/myportal/viewall.js
+++ b/components/myportal/viewall.js
@@ -686,7 +686,7 @@ const ViewAllResults = (props) => {
                                   ] || "N/A"}
                     </dd>
                     {isAwaitingSubmissionDetails && (
-                        <dd className="govuk-summary-list__value govuk-!-font-size-16 cardModuleItem ">
+                        <dd className="govuk-summary-list__value govuk-!-font-size-16  ">
                             <button
                                 title={t(
                                     "case:do-you-want-to-delete-case-label"
@@ -714,7 +714,7 @@ const ViewAllResults = (props) => {
                         </dd>
                     )}
                     {isMyRepresentations && (
-                        <dd className="govuk-summary-list__value govuk-!-font-size-16 cardModuleItem ">
+                        <dd className="govuk-summary-list__value govuk-!-font-size-16 ">
                             <button
                                 title={t(
                                     "case:do-you-want-to-delete-rep-label"
@@ -733,7 +733,7 @@ const ViewAllResults = (props) => {
                                     ) &&
                                         deleteRepItem(
                                             props.accountDetails.containerID,
-                                            item.pinswg_name,
+                                            item.caseRef,
                                             item.repfile_name
                                         );
                                 }}
@@ -744,12 +744,12 @@ const ViewAllResults = (props) => {
                     )}
 
                     {isWatchedCases && (
-                        <dd className="govuk-summary-list__value govuk-!-font-size-16 cardModuleItem ">
+                        <dd className="govuk-summary-list__value govuk-!-font-size-14 govuk-summary-list__action">
                             <button
                                 title={t(
                                     "case:do-you-want-to-delete-case-label"
                                 )}
-                                className=" cardModuleRemoveCase govuk-link govuk-link--no-underline govuk-link--inverse "
+                                className=" cardModuleRemoveCase govuk-summary-list__actionLink watched_link"
                                 onClick={() => {
                                     confirm(
                                         t(
@@ -769,7 +769,7 @@ const ViewAllResults = (props) => {
                             </button>
                             {item.pinswg_emailnotifications === true ? (
                                 <button
-                                    className="govuk-summary-list__actionLink mailLink watched_link"
+                                    className="govuk-summary-list__actionLink mailLink"
                                     title={t("common:unsubscribe-title-label")}
                                     onClick={() => {
                                         confirm(
@@ -928,8 +928,26 @@ const ViewAllResults = (props) => {
                 .then((data) => data)
                 .then(() => {
                     getWatchedCasesProxy(cookies.pinsUser).then((data) => {
-                        (setWatchedCases(data),
-                            getDetailsProxy(data, "myWatchedCases")
+                        let showWatchedCases = (submittedArr) => {
+                            const required = submittedArr.value.filter((el) => {
+                                return (
+                                    el.pinswg_representationsubmitted == null
+                                );
+                            });
+
+                            let newObj = {};
+                            return Object.assign(newObj, {
+                                "@odata.count": required.length,
+                                "value": required
+                            });
+                        };
+
+                        let filteredWatchedCases = showWatchedCases(data);
+                        (setWatchedCases(filteredWatchedCases),
+                            getDetailsProxy(
+                                filteredWatchedCases,
+                                "myWatchedCases"
+                            )
                                 .then((data) => {
                                     setWatchedCasesDetails(data);
                                 })
diff --git a/i18n.js b/i18n.js
index aaac19af..9e62f9c3 100644
--- a/i18n.js
+++ b/i18n.js
@@ -60,7 +60,7 @@ module.exports = {
         "/myportal/[appealtypes]": ["newappeal", "home", "myportal"],
         "/newappeal": ["newappeal", "home"],
         "/newappeal/*": ["newappeal", "home"],
-        "/newappeal/[appealtypes]": ["newappeal", "home"],
+        "/newappeal/[appealtypes]": ["newappeal", "home", "myportal"],
         "/newappeal/selectappeal": ["newappeal", "home"],
         "/dns/*": ["dnsCommon", "case", "common"],
         "/dns/[developmentName]": ["dnsCommon", "case", "common"],
diff --git a/memory-bank/activeContext.md b/memory-bank/activeContext.md
index 5ae5f9f9..7776b830 100644
--- a/memory-bank/activeContext.md
+++ b/memory-bank/activeContext.md
@@ -458,6 +458,97 @@
 - Response-shape contract stability preserved for touched handlers/services.
 - Remaining risk is primarily external dependency behavior on valid-hash happy paths in local environments (relay/storage), not hash-bypass behavior.
 
+## Phase 15 hardening status (2026-03-13)
+
+- Working branch created from `origin/SIPS-Development`:
+    - `TASK22028-phase15-hardening-slice`
+- Delivered consistency-only hardening across 4 additional sensitive file handlers:
+    - `pages/api/file/upload.js`
+    - `pages/api/file/uploadsinglefile.js`
+    - `pages/api/file/createappealcompletemessage_api.js`
+    - `pages/api/file/setupcontainer.js`
+- Hardening posture updates:
+    - standardized explicit early 400 on missing hash where validation was already required
+    - standardized early hash-mismatch return path style in `setupcontainer`
+    - preserved response-shape/signature contracts (no intended contract changes)
+- Added focused phase-15 tests:
+    - `tests/phase15/service-behaviour.test.cjs`
+    - negative-path checks for missing/invalid hash across all selected handlers
+    - required-input negative-path checks where applicable
+    - one valid-hash mocked happy-path check (`setupcontainer` response shape)
+
+### Phase 15 validation evidence snapshot
+
+- `node tests/phase6/service-parity.test.cjs` -> pass
+- `node tests/phase6/service-behaviour.test.cjs` -> pass (8/8)
+- `node tests/phase7/service-behaviour.test.cjs` -> pass (10/10)
+- `node tests/phase8/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase9/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase10/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase11/service-behaviour.test.cjs` -> pass (4/4)
+- `node tests/phase12/service-behaviour.test.cjs` -> pass (4/4)
+- `node tests/phase13/service-behaviour.test.cjs` -> pass (7/7)
+- `node tests/phase14/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase15/service-behaviour.test.cjs` -> pass (5/5)
+- `npm run lint` -> warnings only (pre-existing `react-hooks/exhaustive-deps` warnings)
+
+### Phase 15 manual HTTP snapshot
+
+- Dev server run on `http://localhost:3002`.
+- Missing/invalid hash negative-path checks for selected handlers -> **400**.
+- Missing required params where applicable -> **400**.
+- Valid-hash spot-check:
+    - `GET /api/file/setupcontainer?ident=c1&hash=<valid>` -> **200**.
+
+## Phase 16 hardening status (2026-03-13)
+
+- Continued on branch:
+    - `TASK22028-phase15-hardening-slice`
+- Added a consistency-only file-proxy hardening slice across:
+    - `pages/api/file/getbloblistproxy.js`
+    - `pages/api/file/getrepsblobproxy.js`
+    - `pages/api/file/getawaitingsubmissionfromblobproxy.js`
+- Changes focused on:
+    - standardized required-input guards via `hasValue`
+    - removed unused imports/dead constants from touched proxy handlers
+    - preserved existing response contracts and status semantics
+- Added focused test pack:
+    - `tests/phase16/service-behaviour.test.cjs`
+
+### Phase 16 validation evidence snapshot
+
+- phase6 parity + phase6–phase15 behavioural suites: pass
+- phase16 behavioural suite: pass (4/4)
+- lint: warnings only (pre-existing)
+
+## Follow-up status (2026-03-13)
+
+- Applied targeted signer allow-list fix for browser delete-awaiting-submission path.
+- Updated `pages/api/endpoint/gethash_api.js` allow-list with:
+    - `/api/file/deleteblobcase`
+- Added focused behavioural test:
+    - `tests/phase14/service-behaviour.test.cjs` now includes allow-list coverage for deleteblobcase path.
+
+## Follow-up status (2026-03-13 — additional delete flows)
+
+- Expanded signer allow-list for additional browser delete paths:
+    - `/api/endpoint/deletemyrepresentations_api`
+    - `/api/endpoint/deletewatchedcases_api`
+    - `/api/file/deleteblobrep`
+- Migrated affected direct-service delete calls to signer-based hash retrieval:
+    - `portalDirectService.deleteWatchedCases`
+    - `portalDirectService.deleteMyRepresentations`
+    - `documentDirectService.deleteAwaitingSubmissionsFromBlob`
+    - `documentDirectService.deleteMyRepresentationsFromBlob`
+
+## Follow-up status (2026-03-13 — myportal + i18n alignment)
+
+- Updated myportal representation delete call sites to pass `caseRef`:
+    - `components/myportal/topthree_reps.js`
+    - `components/myportal/viewall.js`
+- Applied small view-all presentation cleanup and watched-case refresh filtering adjustment.
+- Added missing `myportal` namespace mapping in `i18n.js` for `/newappeal/[appealtypes]`.
+
 ## Likely next steps
 
 1. Stabilize and simplify breadcrumb/back-link decision logic with focused regression checks.
diff --git a/memory-bank/change-log.md b/memory-bank/change-log.md
index d5f61e80..2aafa659 100644
--- a/memory-bank/change-log.md
+++ b/memory-bank/change-log.md
@@ -929,3 +929,186 @@ Follow-ups:
 - Keep signer allow-list expansion minimal and task-driven.
 - Continue replacing remaining browser-side direct hash assumptions only where flows require it.
 - Confirm work-item/branch naming alignment for any subsequent phase slices if strict tracker continuity is required.
+
+---
+
+### CL-026: Phase 15 hardening — consistency guards for additional hash-sensitive file handlers
+
+date: 2026-03-13
+author: Cline
+scope: `pages/api/file/{upload,uploadsinglefile,createappealcompletemessage_api,setupcontainer}.js`, `tests/phase15/service-behaviour.test.cjs`, `memory-bank/*`
+type: change
+rationale: Deliver a small reversible consistency-only hardening slice by standardizing missing/invalid hash negative paths and required input handling in additional sensitive file handlers.
+impact: Consistent early 400 behavior for missing/invalid hash and missing required params while preserving existing response shapes/signatures.
+status: completed
+
+Summary:
+
+- Started new branch from `origin/SIPS-Development`: `TASK22028-phase15-hardening-slice`.
+- Applied minimal hardening updates:
+    - `upload.js`: explicit missing-hash guard before hash comparison.
+    - `uploadsinglefile.js`: explicit missing-hash guard before hash comparison.
+    - `createappealcompletemessage_api.js`: added missing-hash guard to existing required-input guard block.
+    - `setupcontainer.js`: standardized to early-return on hash mismatch; contract and status behavior preserved.
+- Added focused tests:
+    - `tests/phase15/service-behaviour.test.cjs`
+    - covers missing-hash negative paths for all selected handlers
+    - includes required-input negative paths and one valid-hash happy-path shape check.
+
+Validation:
+
+- `node tests/phase6/service-parity.test.cjs` -> pass
+- `node tests/phase6/service-behaviour.test.cjs` -> pass (8/8)
+- `node tests/phase7/service-behaviour.test.cjs` -> pass (10/10)
+- `node tests/phase8/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase9/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase10/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase11/service-behaviour.test.cjs` -> pass (4/4)
+- `node tests/phase12/service-behaviour.test.cjs` -> pass (4/4)
+- `node tests/phase13/service-behaviour.test.cjs` -> pass (7/7)
+- `node tests/phase14/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase15/service-behaviour.test.cjs` -> pass (5/5)
+- `npm run lint` -> warnings only (pre-existing hook dependency warnings)
+- Manual checks on `localhost:3002`:
+    - invalid/missing hash for each selected handler -> 400
+    - missing required params where applicable -> 400
+    - valid-hash spot-check (`setupcontainer`) -> 200
+
+Follow-ups:
+
+- Continue small-batch consistency hardening for remaining sensitive handlers where guard patterns are still inconsistent.
+- Keep manual happy-path checks constrained to feasible local dependencies; document downstream/environment-caused failures separately.
+
+---
+
+### CL-027: Phase 16 hardening — file proxy required-input guard consistency slice
+
+date: 2026-03-13
+author: Cline
+scope: `pages/api/file/{getbloblistproxy,getrepsblobproxy,getawaitingsubmissionfromblobproxy}.js`, `tests/phase16/service-behaviour.test.cjs`, `memory-bank/*`
+type: change
+rationale: Continue within the same branch using separate commits to apply a small consistency-only hardening slice for sensitive file proxy handlers.
+impact: More consistent required-input validation and cleaner proxy handler internals without changing response-shape/signature contracts.
+status: completed
+
+Summary:
+
+- Continued on `TASK22028-phase15-hardening-slice` as a separate commit.
+- Standardized required-input guards using a local `hasValue` helper in 3 file proxy handlers.
+- Removed unused imports/constants from touched files.
+- Added `tests/phase16/service-behaviour.test.cjs` with negative-path coverage and one valid-input contract check.
+
+Validation:
+
+- `node tests/phase6/service-parity.test.cjs` -> pass
+- `node tests/phase6/service-behaviour.test.cjs` -> pass (8/8)
+- `node tests/phase7/service-behaviour.test.cjs` -> pass (10/10)
+- `node tests/phase8/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase9/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase10/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase11/service-behaviour.test.cjs` -> pass (4/4)
+- `node tests/phase12/service-behaviour.test.cjs` -> pass (4/4)
+- `node tests/phase13/service-behaviour.test.cjs` -> pass (7/7)
+- `node tests/phase14/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase15/service-behaviour.test.cjs` -> pass (5/5)
+- `node tests/phase16/service-behaviour.test.cjs` -> pass (4/4)
+- `npm run lint` -> warnings only (pre-existing)
+- Manual checks (`localhost:3002`): missing required inputs across selected proxies -> 400
+
+Follow-ups:
+
+- Continue incremental endpoint/file proxy consistency slices with same contract-preserving constraints.
+
+---
+
+### CL-028: Follow-up fix — signer allow-list expanded for deleteblobcase browser path
+
+date: 2026-03-13
+author: Cline
+scope: `pages/api/endpoint/gethash_api.js`, `tests/phase14/service-behaviour.test.cjs`
+type: change
+rationale: Resolve runtime failure where browser-side `deleteAwaitingSubmissionsFromBlob` hash signing requested a path not present in signer allow-list.
+impact: Restores browser-safe hash signing for delete-blob-case flow without weakening auth/session guard on signer endpoint.
+status: completed
+
+Summary:
+
+- Added `/api/file/deleteblobcase` to `gethash_api` allow-list.
+- Added focused test coverage in phase-14 suite for the new allow-listed path.
+
+Validation:
+
+- `node tests/phase14/service-behaviour.test.cjs` -> pass (6/6)
+- `node tests/phase7/service-behaviour.test.cjs` -> pass (10/10)
+- `npm run lint` -> warnings only (pre-existing)
+
+Follow-ups:
+
+- Keep signer allow-list additions minimal and path-specific.
+
+---
+
+### CL-029: Follow-up fix — signer coverage for additional delete flows
+
+date: 2026-03-13
+author: Cline
+scope: `actions/services/{portalDirectService,documentDirectService}.js`, `pages/api/endpoint/gethash_api.js`, `tests/phase7/service-behaviour.test.cjs`, `tests/phase14/service-behaviour.test.cjs`
+type: change
+rationale: Resolve browser hash-signing gaps for additional delete operations still using direct client hash generation.
+impact: Restores browser-safe signing for delete watched cases, delete my representations, and delete blob representation/awaiting-submission paths while retaining authenticated allow-list signer model.
+status: completed
+
+Summary:
+
+- Updated signer allow-list to include:
+    - `/api/endpoint/deletemyrepresentations_api`
+    - `/api/endpoint/deletewatchedcases_api`
+    - `/api/file/deleteblobrep`
+- Migrated direct service calls to signer-based hash retrieval for:
+    - `portalDirectService.deleteWatchedCases`
+    - `portalDirectService.deleteMyRepresentations`
+    - `documentDirectService.deleteAwaitingSubmissionsFromBlob`
+    - `documentDirectService.deleteMyRepresentationsFromBlob`
+- Extended focused tests:
+    - `tests/phase7/service-behaviour.test.cjs` (service signer usage)
+    - `tests/phase14/service-behaviour.test.cjs` (allow-list coverage)
+
+Validation:
+
+- `node tests/phase7/service-behaviour.test.cjs` -> pass (12/12)
+- `node tests/phase14/service-behaviour.test.cjs` -> pass (9/9)
+- `npm run lint` -> warnings only (pre-existing)
+
+Follow-ups:
+
+- Keep allow-list expansion path-scoped and driven by concrete browser-call requirements only.
+
+---
+
+### CL-030: Follow-up fix — myportal delete caseRef alignment + i18n namespace
+
+date: 2026-03-13
+author: Cline
+scope: `components/myportal/{viewall,topthree_reps}.js`, `i18n.js`, `memory-bank/*`
+type: change
+rationale: Align representation delete calls to stable case reference identifier and resolve missing locale namespace mapping for new-appeal route context.
+impact: Prevents delete-call identifier mismatches in myportal representation flows and restores expected translation namespace availability for `/newappeal/[appealtypes]`.
+status: completed
+
+Summary:
+
+- Updated delete-representation callers to pass `caseRef` instead of display/ticket values in:
+    - `components/myportal/topthree_reps.js`
+    - `components/myportal/viewall.js`
+- Included related view-all styling/class tidy updates and watched-case list refresh filtering adjustment.
+- Added missing `myportal` namespace for route key:
+    - `i18n.js` -> `/newappeal/[appealtypes]`
+
+Validation:
+
+- `node tests/phase7/service-behaviour.test.cjs` -> pass (12/12)
+- `npm run lint` -> warnings only (pre-existing)
+
+Follow-ups:
+
+- Keep delete calls consistently keyed on case reference across portal/view-all/top-three variants.
diff --git a/memory-bank/progress.md b/memory-bank/progress.md
index 8ed83923..6075ffef 100644
--- a/memory-bank/progress.md
+++ b/memory-bank/progress.md
@@ -588,6 +588,162 @@
 3. Remove `tests/phase8/service-behaviour.test.cjs` if full slice rollback required.
 4. Re-run phase6/7 baseline tests + lint after rollback.
 
+## Latest update (2026-03-13 — Phase 15 hardening slice)
+
+- New branch created from `origin/SIPS-Development` with confirmed work item prefix:
+    - `TASK22028-phase15-hardening-slice`
+- Delivered a small consistency-only hardening slice across 4 additional sensitive file handlers:
+    - `pages/api/file/upload.js`
+    - `pages/api/file/uploadsinglefile.js`
+    - `pages/api/file/createappealcompletemessage_api.js`
+    - `pages/api/file/setupcontainer.js`
+- Scope delivered:
+    - standardized explicit early 400 handling for missing hash in handlers where hash validation was present but missing-hash guard was inconsistent
+    - standardized guard style in `setupcontainer` to early-return on hash mismatch (same status/contract)
+    - standardized missing required hash handling in `createappealcompletemessage_api`
+    - preserved response shapes and signatures (no contract changes)
+- Added focused phase-15 tests:
+    - `tests/phase15/service-behaviour.test.cjs`
+    - negative-path coverage for missing hash across all 4 handlers
+    - additional required-input checks where applicable
+    - one valid-hash happy-path contract check (`setupcontainer` -> 200 with existing response shape)
+
+### Validation snapshot (Phase 15)
+
+- `node tests/phase6/service-parity.test.cjs` -> **pass**
+- `node tests/phase6/service-behaviour.test.cjs` -> **pass** (8/8)
+- `node tests/phase7/service-behaviour.test.cjs` -> **pass** (10/10)
+- `node tests/phase8/service-behaviour.test.cjs` -> **pass** (5/5)
+- `node tests/phase9/service-behaviour.test.cjs` -> **pass** (5/5)
+- `node tests/phase10/service-behaviour.test.cjs` -> **pass** (5/5)
+- `node tests/phase11/service-behaviour.test.cjs` -> **pass** (4/4)
+- `node tests/phase12/service-behaviour.test.cjs` -> **pass** (4/4)
+- `node tests/phase13/service-behaviour.test.cjs` -> **pass** (7/7)
+- `node tests/phase14/service-behaviour.test.cjs` -> **pass** (5/5)
+- `node tests/phase15/service-behaviour.test.cjs` -> **pass** (5/5)
+- `npm run lint` -> **warnings only** (pre-existing `react-hooks/exhaustive-deps` warnings)
+
+### Manual HTTP snapshot (Phase 15)
+
+- Dev server run on `http://localhost:3002`.
+- Negative-path checks:
+    - `POST /api/file/upload` missing hash -> **400**
+    - `POST /api/file/upload?hash=wrong` -> **400**
+    - `POST /api/file/uploadsinglefile` missing hash -> **400**
+    - `POST /api/file/uploadsinglefile?hash=wrong` -> **400**
+    - `GET /api/file/createappealcompletemessage_api?container=c1&tempcaseref=t1` missing hash -> **400**
+    - `GET /api/file/createappealcompletemessage_api?container=c1&tempcaseref=t1&hash=wrong` -> **400**
+    - `GET /api/file/createappealcompletemessage_api?container=c1` missing required params/hash -> **400**
+    - `GET /api/file/setupcontainer?ident=c1` missing hash -> **400**
+    - `GET /api/file/setupcontainer?ident=c1&hash=wrong` -> **400**
+    - `GET /api/file/setupcontainer?hash=<valid>` missing required `ident` -> **400**
+- Valid-hash spot-check:
+    - `GET /api/file/setupcontainer?ident=c1&hash=<valid>` -> **200**
+
+### Rollback plan (Phase 15)
+
+1. Revert these files:
+    - `pages/api/file/upload.js`
+    - `pages/api/file/uploadsinglefile.js`
+    - `pages/api/file/createappealcompletemessage_api.js`
+    - `pages/api/file/setupcontainer.js`
+    - `tests/phase15/service-behaviour.test.cjs`
+2. Re-run phase6–phase15 tests and lint to confirm parity.
+
+## Latest update (2026-03-13 — Phase 16 file-proxy consistency slice)
+
+- Continued on branch:
+    - `TASK22028-phase15-hardening-slice`
+- Delivered a small consistency-only hardening slice across 3 sensitive file proxy handlers:
+    - `pages/api/file/getbloblistproxy.js`
+    - `pages/api/file/getrepsblobproxy.js`
+    - `pages/api/file/getawaitingsubmissionfromblobproxy.js`
+- Scope delivered:
+    - removed unused imports/constants in touched handlers to reduce noisy/unsafe dead code
+    - standardized required input checks using shared local `hasValue` pattern
+    - preserved response shape/signature/status behavior contracts
+- Added focused tests:
+    - `tests/phase16/service-behaviour.test.cjs`
+    - negative-path checks for missing required container/casefolder inputs
+    - one valid-input happy-path contract check for `getbloblistproxy` (200 + passthrough shape)
+
+### Validation snapshot (Phase 16)
+
+- `node tests/phase6/service-parity.test.cjs` -> **pass**
+- `node tests/phase6/service-behaviour.test.cjs` -> **pass** (8/8)
+- `node tests/phase7/service-behaviour.test.cjs` -> **pass** (10/10)
+- `node tests/phase8/service-behaviour.test.cjs` -> **pass** (5/5)
+- `node tests/phase9/service-behaviour.test.cjs` -> **pass** (5/5)
+- `node tests/phase10/service-behaviour.test.cjs` -> **pass** (5/5)
+- `node tests/phase11/service-behaviour.test.cjs` -> **pass** (4/4)
+- `node tests/phase12/service-behaviour.test.cjs` -> **pass** (4/4)
+- `node tests/phase13/service-behaviour.test.cjs` -> **pass** (7/7)
+- `node tests/phase14/service-behaviour.test.cjs` -> **pass** (5/5)
+- `node tests/phase15/service-behaviour.test.cjs` -> **pass** (5/5)
+- `node tests/phase16/service-behaviour.test.cjs` -> **pass** (4/4)
+- `npm run lint` -> **warnings only** (pre-existing `react-hooks/exhaustive-deps` warnings)
+
+### Manual HTTP checks (Phase 16)
+
+- Dev server on `http://localhost:3002`.
+- Negative-path checks:
+    - `/api/file/getbloblistproxy?casefolderID=case-1` -> **400**
+    - `/api/file/getbloblistproxy?container=c1` -> **400**
+    - `/api/file/getrepsblobproxy` -> **400**
+    - `/api/file/getawaitingsubmissionfromblobproxy` -> **400**
+- Feasible valid-input spot-check:
+    - `/api/file/getbloblistproxy?container=c1&casefolderID=case-1` -> **400** (expected downstream/local dependency behavior; input guard passed)
+
+### Rollback plan (Phase 16)
+
+1. Revert commit `c196edb` or files:
+    - `pages/api/file/getbloblistproxy.js`
+    - `pages/api/file/getrepsblobproxy.js`
+    - `pages/api/file/getawaitingsubmissionfromblobproxy.js`
+    - `tests/phase16/service-behaviour.test.cjs`
+2. Re-run phase6–phase16 tests and lint.
+
+## Latest update (2026-03-13 — signer allow-list follow-up)
+
+- Branch: `TASK22028-phase15-hardening-slice`
+- Fix applied:
+    - added `/api/file/deleteblobcase` to signer endpoint allow-list in `pages/api/endpoint/gethash_api.js`
+- Test update:
+    - extended `tests/phase14/service-behaviour.test.cjs` with deleteblobcase allow-list coverage
+
+### Validation snapshot (follow-up)
+
+- `node tests/phase14/service-behaviour.test.cjs` -> **pass** (6/6)
+- `node tests/phase7/service-behaviour.test.cjs` -> **pass** (10/10)
+- `npm run lint` -> **warnings only** (pre-existing)
+
+## Latest update (2026-03-13 — signer delete-flow follow-up)
+
+- Branch: `TASK22028-phase15-hardening-slice`
+- Extended signer allow-list and browser signer usage for additional delete flows:
+    - `deleteWatchedCases`
+    - `deleteMyRepresentations`
+    - `deleteAwaitingSubmissionsFromBlob`
+    - `deleteMyRepresentationsFromBlob`
+
+### Validation snapshot (delete-flow follow-up)
+
+- `node tests/phase7/service-behaviour.test.cjs` -> **pass** (12/12)
+- `node tests/phase14/service-behaviour.test.cjs` -> **pass** (9/9)
+- `npm run lint` -> **warnings only** (pre-existing)
+
+## Latest update (2026-03-13 — myportal + i18n follow-up)
+
+- Branch: `TASK22028-phase15-hardening-slice`
+- Delivered follow-up fixes:
+    - myportal representation delete calls now use `caseRef` in top-three and view-all flows
+    - missing `myportal` namespace added for `/newappeal/[appealtypes]` in `i18n.js`
+
+### Validation snapshot (myportal + i18n follow-up)
+
+- `node tests/phase7/service-behaviour.test.cjs` -> **pass** (12/12)
+- `npm run lint` -> **warnings only** (pre-existing)
+
 ## Outstanding risks / gaps
 
 - Navigation regressions across EN/CY + route query combinations.
diff --git a/memory-bank/refactor-plan-actions-index.md b/memory-bank/refactor-plan-actions-index.md
index bc73a5bc..31881604 100644
--- a/memory-bank/refactor-plan-actions-index.md
+++ b/memory-bank/refactor-plan-actions-index.md
@@ -467,6 +467,116 @@ Status key: `[x] done`, `[ ] pending`
 - Revert `b8fa514` to remove getrepsblob contract-alignment + Quill import fix.
 - Re-run phase6–phase14 tests and lint after rollback.
 
+### Phase 15 completion snapshot (2026-03-13)
+
+Status key: `[x] done`, `[ ] pending`
+
+1. `[x]` Create new branch from `origin/SIPS-Development` with required work item prefix
+    - branch: `TASK22028-phase15-hardening-slice`
+2. `[x]` Apply minimal consistency-only hardening in 4 additional sensitive handlers
+    - `pages/api/file/upload.js`
+    - `pages/api/file/uploadsinglefile.js`
+    - `pages/api/file/createappealcompletemessage_api.js`
+    - `pages/api/file/setupcontainer.js`
+3. `[x]` Standardize negative-path behavior
+    - explicit early 400 for missing/invalid hash in selected handlers
+    - explicit missing required-input checks where route contract requires them
+    - preserved response-shape contracts and function signatures
+4. `[x]` Add focused Phase 15 tests
+    - added `tests/phase15/service-behaviour.test.cjs`
+    - includes negative-path tests for missing/invalid hash + required-input checks
+    - includes one valid-hash mocked happy-path response-shape check
+5. `[x]` Execute required validation bundle
+    - phase6 parity + phase6–phase14 behaviour tests -> pass
+    - phase15 behaviour tests -> pass
+    - lint -> warnings only (pre-existing)
+6. `[x]` Execute targeted manual checks
+    - missing/invalid hash across selected handlers -> 400
+    - missing required params where applicable -> 400
+    - valid-hash `setupcontainer` spot-check -> 200
+
+### Phase 15 rollback notes
+
+- Revert these files to rollback the full hardening slice:
+    - `pages/api/file/upload.js`
+    - `pages/api/file/uploadsinglefile.js`
+    - `pages/api/file/createappealcompletemessage_api.js`
+    - `pages/api/file/setupcontainer.js`
+    - `tests/phase15/service-behaviour.test.cjs`
+- Re-run phase6–phase15 baseline tests and lint after rollback to confirm parity.
+
+### Phase 16 completion snapshot (2026-03-13)
+
+Status key: `[x] done`, `[ ] pending`
+
+1. `[x]` Continue on current branch with separate commit for additional small slice
+    - branch: `TASK22028-phase15-hardening-slice`
+2. `[x]` Apply minimal consistency hardening in 3 file proxy handlers
+    - `pages/api/file/getbloblistproxy.js`
+    - `pages/api/file/getrepsblobproxy.js`
+    - `pages/api/file/getawaitingsubmissionfromblobproxy.js`
+3. `[x]` Standardize required-input guard pattern
+    - added local `hasValue` checks for required params
+    - removed unused/dead imports/constants in touched files
+4. `[x]` Add focused Phase 16 tests
+    - added `tests/phase16/service-behaviour.test.cjs`
+    - missing-input negative-path checks + one valid-input contract check
+5. `[x]` Execute validation bundle
+    - phase6 parity + phase6–phase16 behaviour tests pass
+    - lint warnings only (pre-existing)
+6. `[x]` Execute manual checks
+    - missing required-input proxy calls -> 400
+
+### Phase 16 rollback notes
+
+- Revert commit `c196edb` (or files):
+    - `pages/api/file/getbloblistproxy.js`
+    - `pages/api/file/getrepsblobproxy.js`
+    - `pages/api/file/getawaitingsubmissionfromblobproxy.js`
+    - `tests/phase16/service-behaviour.test.cjs`
+- Re-run phase6–phase16 baseline tests and lint.
+
+### Follow-up completion snapshot (2026-03-13)
+
+1. `[x]` Address browser signer failure for delete-awaiting-submission path
+    - added signer allow-list entry: `/api/file/deleteblobcase`
+2. `[x]` Add focused behavioural test coverage
+    - extended `tests/phase14/service-behaviour.test.cjs`
+3. `[x]` Validate
+    - phase14 behaviour tests pass (6/6)
+    - phase7 behaviour tests pass (10/10)
+    - lint warnings only (pre-existing)
+
+### Follow-up rollback notes
+
+- Revert commit `49dd990` to undo allow-list/test follow-up.
+
+### Follow-up completion snapshot (2026-03-13 — additional delete flows)
+
+1. `[x]` Expand signer allow-list for required browser delete paths
+2. `[x]` Move remaining delete service calls to signer-based hash retrieval
+3. `[x]` Extend focused service/signer tests
+4. `[x]` Validate
+    - phase7 behaviour tests pass (12/12)
+    - phase14 behaviour tests pass (9/9)
+    - lint warnings only (pre-existing)
+
+### Follow-up rollback notes (additional delete flows)
+
+- Revert the follow-up commit for this slice to restore prior hashing behavior.
+
+### Follow-up completion snapshot (2026-03-13 — myportal + i18n alignment)
+
+1. `[x]` Align myportal delete-representation calls to use `caseRef`
+2. `[x]` Add missing i18n namespace mapping for `/newappeal/[appealtypes]`
+3. `[x]` Validate
+    - phase7 behaviour tests pass (12/12)
+    - lint warnings only (pre-existing)
+
+### Follow-up rollback notes (myportal + i18n alignment)
+
+- Revert commit `d32d7d0` to restore prior myportal/i18n state.
+
 ## Safe execution mode for migration chunks (required)
 
 To reduce terminal hangs during bulk migration work, run refactor chunks in **safe stepwise mode** instead of long chained commands.
diff --git a/pages/api/endpoint/gethash_api.js b/pages/api/endpoint/gethash_api.js
index 5927cf87..4c1ce596 100644
--- a/pages/api/endpoint/gethash_api.js
+++ b/pages/api/endpoint/gethash_api.js
@@ -14,8 +14,12 @@ ApiProxy.get(async (req, res) => {
     const queryPath = req.query.path;
     const allowedPrefix = [
         "/api/endpoint/getportallogin_api",
+        "/api/endpoint/deletemyrepresentations_api",
+        "/api/endpoint/deletewatchedcases_api",
         "/api/file/upload",
         "/api/file/uploadsinglefile",
+        "/api/file/deleteblobcase",
+        "/api/file/deleteblobrep",
         "/api/file/createrepcompletemessage_api",
         "/api/file/createappealcompletemessage_api"
     ];
diff --git a/pages/api/file/createappealcompletemessage_api.js b/pages/api/file/createappealcompletemessage_api.js
index 83fcb8a9..2c96b1a3 100644
--- a/pages/api/file/createappealcompletemessage_api.js
+++ b/pages/api/file/createappealcompletemessage_api.js
@@ -26,7 +26,9 @@ ApiProxy.get(async (req, res) => {
         typeof containerName === "undefined" ||
         containerName.length === 0 ||
         typeof tempCaseRef === "undefined" ||
-        tempCaseRef.length === 0
+        tempCaseRef.length === 0 ||
+        typeof checkHash === "undefined" ||
+        checkHash.length === 0
     ) {
         return res.status(400).json();
     }
diff --git a/pages/api/file/getawaitingsubmissionfromblobproxy.js b/pages/api/file/getawaitingsubmissionfromblobproxy.js
index 2e05852a..6f8e3ef7 100644
--- a/pages/api/file/getawaitingsubmissionfromblobproxy.js
+++ b/pages/api/file/getawaitingsubmissionfromblobproxy.js
@@ -1,30 +1,18 @@
-import {
-    downloadAllProgressFiles,
-    getAllProgressBlobs
-} from "../../../actions/azurestorage";
-import _ from "lodash";
-import nextConnect from "next-connect";
-import middleware from "../middleware/middleware";
 import { getToken } from "../../../actions/core/token";
 import { azureHeaders } from "../../../actions/core/headers";
 import { consoleLogger } from "../../../actions/core/logger";
 import { hashAPIPath } from "../../../actions/core/hash";
 import axios from "axios";
-import CryptoJS from "crypto-js";
-
-const WORDKEY = process.env.HASHKEY;
-
-const WEBAPI_URL =
-    process.env.RELAY_ROOT ||
-    "https://dev-pedw-ns.servicebus.windows.net/dev-pedw-hc/";
 
 const BASE_URL = process.env.API_ROOT || `http://localhost:${port}`;
 
+const hasValue = (value) =>
+    typeof value === "string" && value.trim().length > 0;
+
 export default async function ApiProxy(req, res) {
     var containerName = req.query.container;
-    var checkHash = req.query.hash;
 
-    if (typeof containerName === "undefined" || containerName.length === 0) {
+    if (!hasValue(containerName)) {
         return res.status(400).json();
     }
 
diff --git a/pages/api/file/getbloblistproxy.js b/pages/api/file/getbloblistproxy.js
index 8032d1c8..10a7b958 100644
--- a/pages/api/file/getbloblistproxy.js
+++ b/pages/api/file/getbloblistproxy.js
@@ -1,36 +1,19 @@
-import {
-    downloadAllProgressFiles,
-    getAllProgressBlobs
-} from "../../../actions/azurestorage";
-import _ from "lodash";
-import nextConnect from "next-connect";
-import middleware from "../middleware/middleware";
 import { getToken } from "../../../actions/core/token";
 import { azureHeaders } from "../../../actions/core/headers";
 import { consoleLogger } from "../../../actions/core/logger";
 import { hashAPIPath } from "../../../actions/core/hash";
 import axios from "axios";
-import CryptoJS from "crypto-js";
-
-const WORDKEY = process.env.HASHKEY;
-
-const WEBAPI_URL =
-    process.env.RELAY_ROOT ||
-    "https://dev-pedw-ns.servicebus.windows.net/dev-pedw-hc/";
 
 const BASE_URL = process.env.API_ROOT || `http://localhost:${port}`;
 
+const hasValue = (value) =>
+    typeof value === "string" && value.trim().length > 0;
+
 export default async function ApiProxy(req, res) {
     var containerName = req.query.container;
     var casefolderID = req.query.casefolderID;
-    var checkHash = req.query.hash;
 
-    if (
-        typeof containerName === "undefined" ||
-        containerName.length === 0 ||
-        typeof casefolderID === "undefined" ||
-        casefolderID.length === 0
-    ) {
+    if (!hasValue(containerName) || !hasValue(casefolderID)) {
         return res.status(400).json();
     }
 
diff --git a/pages/api/file/getrepsblobproxy.js b/pages/api/file/getrepsblobproxy.js
index 7b377b2d..3a0bb850 100644
--- a/pages/api/file/getrepsblobproxy.js
+++ b/pages/api/file/getrepsblobproxy.js
@@ -1,30 +1,18 @@
-import {
-    downloadAllProgressFiles,
-    getAllProgressBlobs
-} from "../../../actions/azurestorage";
-import _ from "lodash";
-import nextConnect from "next-connect";
-import middleware from "../middleware/middleware";
 import { getToken } from "../../../actions/core/token";
 import { azureHeaders } from "../../../actions/core/headers";
 import { consoleLogger } from "../../../actions/core/logger";
 import { hashAPIPath } from "../../../actions/core/hash";
 import axios from "axios";
-import CryptoJS from "crypto-js";
-
-const WORDKEY = process.env.HASHKEY;
-
-const WEBAPI_URL =
-    process.env.RELAY_ROOT ||
-    "https://dev-pedw-ns.servicebus.windows.net/dev-pedw-hc/";
 
 const BASE_URL = process.env.API_ROOT || `http://localhost:${port}`;
 
+const hasValue = (value) =>
+    typeof value === "string" && value.trim().length > 0;
+
 export default async function ApiProxy(req, res) {
     var containerName = req.query.container;
-    var checkHash = req.query.hash;
 
-    if (typeof containerName === "undefined" || containerName.length === 0) {
+    if (!hasValue(containerName)) {
         return res.status(400).json();
     }
 
diff --git a/pages/api/file/setupcontainer.js b/pages/api/file/setupcontainer.js
index 1d251c2f..f02ba816 100644
--- a/pages/api/file/setupcontainer.js
+++ b/pages/api/file/setupcontainer.js
@@ -29,18 +29,18 @@ ApiProxy.get(async (req, res) => {
 
     var checkquerypath = "/api/file/setupcontainer?ident=" + containerName;
 
-    if (hashAPIPath(checkquerypath) == "&hash=" + checkHash) {
-        await createContainer(containerName)
-            .then((data) => {
-                return res.status(200).json({ data: "success", output: data });
-            })
-            .catch((error) => {
-                consoleLogger(error);
-                res.status(400).json(error);
-            });
-    } else {
+    if (hashAPIPath(checkquerypath) != "&hash=" + checkHash) {
         return res.status(400).json();
     }
+
+    await createContainer(containerName)
+        .then((data) => {
+            return res.status(200).json({ data: "success", output: data });
+        })
+        .catch((error) => {
+            consoleLogger(error);
+            res.status(400).json(error);
+        });
 });
 
 export const config = {
diff --git a/pages/api/file/upload.js b/pages/api/file/upload.js
index 2d8afbd2..1185f174 100644
--- a/pages/api/file/upload.js
+++ b/pages/api/file/upload.js
@@ -14,6 +14,10 @@ ApiProxy.use(middleware);
 ApiProxy.post(async (req, res) => {
     var checkHash = req.query.hash;
 
+    if (typeof checkHash === "undefined" || checkHash.length === 0) {
+        return res.status(400).json();
+    }
+
     var checkquerypath = "/api/file/upload";
 
     if (hashAPIPath(checkquerypath) != "?hash=" + checkHash) {
diff --git a/pages/api/file/uploadsinglefile.js b/pages/api/file/uploadsinglefile.js
index e0ebc854..ffbf222e 100644
--- a/pages/api/file/uploadsinglefile.js
+++ b/pages/api/file/uploadsinglefile.js
@@ -37,6 +37,11 @@ ApiProxy.use(middleware);
 
 ApiProxy.post(async (req, res) => {
     var checkHash = req.query.hash;
+
+    if (typeof checkHash === "undefined" || checkHash.length === 0) {
+        return res.status(400).json();
+    }
+
     var checkquerypath = "/api/file/uploadsinglefile";
 
     if (hashAPIPath(checkquerypath) != "?hash=" + checkHash) {
diff --git a/tests/phase14/service-behaviour.test.cjs b/tests/phase14/service-behaviour.test.cjs
index 86bb0714..31a3f599 100644
--- a/tests/phase14/service-behaviour.test.cjs
+++ b/tests/phase14/service-behaviour.test.cjs
@@ -132,6 +132,92 @@ test("gethash_api returns hash for allow-listed getportallogin path", async () =
     });
 });
 
+test("gethash_api returns hash for allow-listed deleteblobcase path", async () => {
+    const mod = loadModule("pages/api/endpoint/gethash_api.js", {
+        hashAPIPath: () => "&hash=deletecase",
+        getSession: async () => ({ user: { id: "u1" } }),
+        nextConnect: createNextConnectMock(),
+        middleware: () => {}
+    });
+
+    const req = {
+        query: { path: "/api/file/deleteblobcase?container=c1&casefolderID=r1" }
+    };
+    const res = createRes();
+    await mod.default.handler(req, res);
+
+    assert.strictEqual(res.state.statusCode, 200);
+    assert.deepStrictEqual(JSON.parse(JSON.stringify(res.state.jsonBody)), {
+        hash: "&hash=deletecase"
+    });
+});
+
+test("gethash_api returns hash for allow-listed deleteblobrep path", async () => {
+    const mod = loadModule("pages/api/endpoint/gethash_api.js", {
+        hashAPIPath: () => "&hash=deleterep",
+        getSession: async () => ({ user: { id: "u1" } }),
+        nextConnect: createNextConnectMock(),
+        middleware: () => {}
+    });
+
+    const req = {
+        query: {
+            path: "/api/file/deleteblobrep?container=c1&casefolderID=r1&repfile=f1"
+        }
+    };
+    const res = createRes();
+    await mod.default.handler(req, res);
+
+    assert.strictEqual(res.state.statusCode, 200);
+    assert.deepStrictEqual(JSON.parse(JSON.stringify(res.state.jsonBody)), {
+        hash: "&hash=deleterep"
+    });
+});
+
+test("gethash_api returns hash for allow-listed deletewatchedcases path", async () => {
+    const mod = loadModule("pages/api/endpoint/gethash_api.js", {
+        hashAPIPath: () => "&hash=watch",
+        getSession: async () => ({ user: { id: "u1" } }),
+        nextConnect: createNextConnectMock(),
+        middleware: () => {}
+    });
+
+    const req = {
+        query: {
+            path: "/api/endpoint/deletewatchedcases_api?watchedCaseID=123"
+        }
+    };
+    const res = createRes();
+    await mod.default.handler(req, res);
+
+    assert.strictEqual(res.state.statusCode, 200);
+    assert.deepStrictEqual(JSON.parse(JSON.stringify(res.state.jsonBody)), {
+        hash: "&hash=watch"
+    });
+});
+
+test("gethash_api returns hash for allow-listed deletemyrepresentations path", async () => {
+    const mod = loadModule("pages/api/endpoint/gethash_api.js", {
+        hashAPIPath: () => "&hash=delrep",
+        getSession: async () => ({ user: { id: "u1" } }),
+        nextConnect: createNextConnectMock(),
+        middleware: () => {}
+    });
+
+    const req = {
+        query: {
+            path: "/api/endpoint/deletemyrepresentations_api?myRepresentationsID=abc"
+        }
+    };
+    const res = createRes();
+    await mod.default.handler(req, res);
+
+    assert.strictEqual(res.state.statusCode, 200);
+    assert.deepStrictEqual(JSON.parse(JSON.stringify(res.state.jsonBody)), {
+        hash: "&hash=delrep"
+    });
+});
+
 test("gethash_api rejects unauthenticated requests with 401", async () => {
     const mod = loadModule("pages/api/endpoint/gethash_api.js", {
         hashAPIPath: () => "&hash=expected",
diff --git a/tests/phase15/service-behaviour.test.cjs b/tests/phase15/service-behaviour.test.cjs
new file mode 100644
index 00000000..207c55eb
--- /dev/null
+++ b/tests/phase15/service-behaviour.test.cjs
@@ -0,0 +1,245 @@
+const fs = require("fs");
+const path = require("path");
+const vm = require("vm");
+const assert = require("assert");
+
+const rootDir = path.resolve(__dirname, "..", "..");
+
+const loadModule = (relativePath, injected = {}) => {
+    const filePath = path.join(rootDir, relativePath);
+    let source = fs.readFileSync(filePath, "utf8");
+
+    source = source.replace(/import[\s\S]*?from\s+"[^"]+";\n?/g, "");
+    source = source.replace(
+        /export default async function\s+(\w+)\s*\(/,
+        "async function $1("
+    );
+    source = source.replace(/export const\s+/g, "const ");
+    source = source.replace(
+        /export default\s+(\w+);/g,
+        "module.exports.default = $1;"
+    );
+
+    source +=
+        '\nif (typeof ApiProxy !== "undefined" && !module.exports.default) module.exports.default = ApiProxy;\n';
+
+    const context = {
+        module: { exports: {} },
+        exports: {},
+        require,
+        process,
+        console: {
+            log: () => {},
+            info: () => {},
+            warn: () => {},
+            error: () => {}
+        },
+        ...injected
+    };
+
+    vm.runInNewContext(source, context, { filename: filePath });
+    return context.module.exports;
+};
+
+const createNextConnectMock = () => {
+    const router = {
+        handler: null,
+        use: () => {},
+        get(fn) {
+            this.handler = fn;
+        },
+        post(fn) {
+            this.handler = fn;
+        }
+    };
+
+    return () => router;
+};
+
+const createRes = () => {
+    const state = {
+        statusCode: null,
+        jsonBody: undefined
+    };
+
+    return {
+        state,
+        status(code) {
+            state.statusCode = code;
+            return this;
+        },
+        json(payload) {
+            state.jsonBody = payload;
+            return payload;
+        }
+    };
+};
+
+const tests = [];
+const test = (name, fn) => tests.push({ name, fn });
+
+test("upload rejects missing hash with 400", async () => {
+    const calls = [];
+    const nextConnect = createNextConnectMock();
+
+    const mod = loadModule("pages/api/file/upload.js", {
+        hashAPIPath: () => "?hash=expected",
+        createBlob: async (...args) => {
+            calls.push(args);
+            return { ok: true };
+        },
+        createRepBlob: async (...args) => {
+            calls.push(args);
+            return { ok: true };
+        },
+        uploadFile: async () => {},
+        nextConnect,
+        middleware: () => {}
+    });
+
+    const req = {
+        query: {},
+        body: { appealData: {}, containerID: ["c1"], casefolderID: ["case-1"] },
+        files: {}
+    };
+    const res = createRes();
+
+    await mod.default.handler(req, res);
+    assert.strictEqual(res.state.statusCode, 400);
+    assert.strictEqual(calls.length, 0);
+});
+
+test("uploadsinglefile rejects missing hash with 400", async () => {
+    const uploadCalls = [];
+    const nextConnect = createNextConnectMock();
+
+    const mod = loadModule("pages/api/file/uploadsinglefile.js", {
+        hashAPIPath: () => "?hash=expected",
+        uploadSingleFile: async (...args) => {
+            uploadCalls.push(args);
+            return { ok: true };
+        },
+        consoleLogger: () => {},
+        fileTypeFromBuffer: async () => ({ mime: "application/pdf" }),
+        fs: { readFileSync: () => Buffer.from("file") },
+        path: { basename: (value) => value },
+        nextConnect,
+        middleware: () => {}
+    });
+
+    const req = {
+        query: {},
+        body: { containerID: ["c1"], casefolderID: ["case-1"] },
+        files: {}
+    };
+    const res = createRes();
+
+    await mod.default.handler(req, res);
+    assert.strictEqual(res.state.statusCode, 400);
+    assert.strictEqual(uploadCalls.length, 0);
+});
+
+test("createappealcompletemessage_api rejects missing hash with 400", async () => {
+    const calls = [];
+    const nextConnect = createNextConnectMock();
+
+    const mod = loadModule(
+        "pages/api/file/createappealcompletemessage_api.js",
+        {
+            hashAPIPath: () => "&hash=expected",
+            getProgressBlobs: async (...args) => {
+                calls.push(args);
+                return { path: "p1" };
+            },
+            downloadProgressFile: async () => ({}),
+            createBlob: async () => ({}),
+            getCaseBlob: async () => ({}),
+            createCaseCompleteMessage: async () => ({}),
+            updateAccount: async () => ({}),
+            consoleLogger: () => {},
+            _: { isEmpty: (value) => !value },
+            nextConnect,
+            middleware: () => {}
+        }
+    );
+
+    const req = {
+        query: { container: "c1", tempcaseref: "tmp-1", inv: 846040001 }
+    };
+    const res = createRes();
+
+    await mod.default.handler(req, res);
+    assert.strictEqual(res.state.statusCode, 400);
+    assert.strictEqual(calls.length, 0);
+});
+
+test("setupcontainer rejects missing hash with 400", async () => {
+    const createCalls = [];
+    const nextConnect = createNextConnectMock();
+
+    const mod = loadModule("pages/api/file/setupcontainer.js", {
+        hashAPIPath: () => "&hash=expected",
+        createContainer: async (...args) => {
+            createCalls.push(args);
+            return { ok: true };
+        },
+        createContainerSas: async () => {},
+        getContainers: async () => {},
+        getBlobs: async () => {},
+        uploadFile: async () => {},
+        consoleLogger: () => {},
+        nextConnect,
+        middleware: () => {}
+    });
+
+    const req = { query: { ident: "container-1" } };
+    const res = createRes();
+
+    await mod.default.handler(req, res);
+    assert.strictEqual(res.state.statusCode, 400);
+    assert.strictEqual(createCalls.length, 0);
+});
+
+test("setupcontainer valid hash returns 200 with expected response shape", async () => {
+    const nextConnect = createNextConnectMock();
+
+    const mod = loadModule("pages/api/file/setupcontainer.js", {
+        hashAPIPath: () => "&hash=expected",
+        createContainer: async () => ({ container: "container-1" }),
+        createContainerSas: async () => {},
+        getContainers: async () => {},
+        getBlobs: async () => {},
+        uploadFile: async () => {},
+        consoleLogger: () => {},
+        nextConnect,
+        middleware: () => {}
+    });
+
+    const req = { query: { ident: "container-1", hash: "expected" } };
+    const res = createRes();
+
+    await mod.default.handler(req, res);
+    assert.strictEqual(res.state.statusCode, 200);
+    assert.deepStrictEqual(JSON.parse(JSON.stringify(res.state.jsonBody)), {
+        data: "success",
+        output: { container: "container-1" }
+    });
+});
+
+const run = async () => {
+    let passed = 0;
+
+    for (const currentTest of tests) {
+        await currentTest.fn();
+        passed += 1;
+    }
+
+    console.log(
+        `Phase 15 behavioural tests passed (${passed}/${tests.length}).`
+    );
+};
+
+run().catch((error) => {
+    console.error(error);
+    process.exit(1);
+});
diff --git a/tests/phase16/service-behaviour.test.cjs b/tests/phase16/service-behaviour.test.cjs
new file mode 100644
index 00000000..467efa1f
--- /dev/null
+++ b/tests/phase16/service-behaviour.test.cjs
@@ -0,0 +1,147 @@
+const fs = require("fs");
+const path = require("path");
+const vm = require("vm");
+const assert = require("assert");
+
+const rootDir = path.resolve(__dirname, "..", "..");
+
+const loadModule = (relativePath, injected = {}) => {
+    const filePath = path.join(rootDir, relativePath);
+    let source = fs.readFileSync(filePath, "utf8");
+
+    source = source.replace(/import[\s\S]*?from\s+"[^"]+";\n?/g, "");
+    source = source.replace(
+        /export default async function\s+(\w+)\s*\(/,
+        "async function $1("
+    );
+    source = source.replace(/export const\s+/g, "const ");
+    source = source.replace(
+        /export default\s+(\w+);/g,
+        "module.exports.default = $1;"
+    );
+    source +=
+        '\nif (typeof ApiProxy !== "undefined" && !module.exports.default) module.exports.default = ApiProxy;\n';
+
+    const context = {
+        module: { exports: {} },
+        exports: {},
+        require,
+        process,
+        console: { log: () => {}, error: () => {} },
+        port: 3000,
+        ...injected
+    };
+
+    vm.runInNewContext(source, context, { filename: filePath });
+    return context.module.exports;
+};
+
+const createRes = () => {
+    const state = {
+        statusCode: null,
+        jsonBody: undefined,
+        sentBody: undefined,
+        headers: {}
+    };
+    return {
+        state,
+        status(code) {
+            state.statusCode = code;
+            return this;
+        },
+        json(payload) {
+            state.jsonBody = payload;
+            return payload;
+        },
+        send(payload) {
+            state.sentBody = payload;
+            return payload;
+        },
+        setHeader(name, value) {
+            state.headers[name] = value;
+        }
+    };
+};
+
+const tests = [];
+const test = (name, fn) => tests.push({ name, fn });
+
+test("getbloblistproxy rejects missing container with 400", async () => {
+    const mod = loadModule("pages/api/file/getbloblistproxy.js", {
+        getToken: async () => ({ access_token: "t" }),
+        hashAPIPath: () => "&hash=expected",
+        azureHeaders: () => ({}),
+        axios: { get: async () => ({ data: { ok: true } }) },
+        consoleLogger: () => {}
+    });
+
+    const req = { query: { casefolderID: "case-1" } };
+    const res = createRes();
+    await mod.default(req, res);
+    assert.strictEqual(res.state.statusCode, 400);
+});
+
+test("getrepsblobproxy rejects missing container with 400", async () => {
+    const mod = loadModule("pages/api/file/getrepsblobproxy.js", {
+        getToken: async () => ({ access_token: "t" }),
+        hashAPIPath: () => "&hash=expected",
+        azureHeaders: () => ({}),
+        axios: { get: async () => ({ data: { ok: true } }) },
+        consoleLogger: () => {}
+    });
+
+    const req = { query: {} };
+    const res = createRes();
+    await mod.default(req, res);
+    assert.strictEqual(res.state.statusCode, 400);
+});
+
+test("getawaitingsubmissionfromblobproxy rejects missing container with 400", async () => {
+    const mod = loadModule(
+        "pages/api/file/getawaitingsubmissionfromblobproxy.js",
+        {
+            getToken: async () => ({ access_token: "t" }),
+            hashAPIPath: () => "&hash=expected",
+            azureHeaders: () => ({}),
+            axios: { get: async () => ({ data: { ok: true } }) },
+            consoleLogger: () => {}
+        }
+    );
+
+    const req = { query: {} };
+    const res = createRes();
+    await mod.default(req, res);
+    assert.strictEqual(res.state.statusCode, 400);
+});
+
+test("getbloblistproxy valid input returns 200 with existing response shape", async () => {
+    const mod = loadModule("pages/api/file/getbloblistproxy.js", {
+        getToken: async () => ({ access_token: "t" }),
+        hashAPIPath: () => "&hash=expected",
+        azureHeaders: () => ({}),
+        axios: { get: async () => ({ data: [{ name: "a" }] }) },
+        consoleLogger: () => {}
+    });
+
+    const req = { query: { container: "c1", casefolderID: "case-1" } };
+    const res = createRes();
+    await mod.default(req, res);
+    assert.strictEqual(res.state.statusCode, 200);
+    assert.deepStrictEqual(res.state.jsonBody, [{ name: "a" }]);
+});
+
+const run = async () => {
+    let passed = 0;
+    for (const t of tests) {
+        await t.fn();
+        passed += 1;
+    }
+    console.log(
+        `Phase 16 behavioural tests passed (${passed}/${tests.length}).`
+    );
+};
+
+run().catch((error) => {
+    console.error(error);
+    process.exit(1);
+});
diff --git a/tests/phase7/service-behaviour.test.cjs b/tests/phase7/service-behaviour.test.cjs
index 00da59c0..305ac424 100644
--- a/tests/phase7/service-behaviour.test.cjs
+++ b/tests/phase7/service-behaviour.test.cjs
@@ -155,10 +155,15 @@ test("document/getAwaitingSubmissionFromBlob logs and returns undefined on failu
 test("portal/deleteMyRepresentations appends hash and returns data", async () => {
     const axios = createAxiosMock();
     const logger = createLoggerMock();
-    const hashCalls = [];
-    const hashAPIPath = (queryPath) => {
-        hashCalls.push(queryPath);
-        return "&hash=portal123";
+    const signCalls = [];
+
+    axios.getHandler = async (url) => {
+        if (url.startsWith("/api/endpoint/gethash_api?path=")) {
+            signCalls.push(url);
+            return { data: { hash: "&hash=portal123" } };
+        }
+
+        throw new Error("Unexpected get url: " + url);
     };
 
     axios.requestHandler = async () => ({ data: { removed: true } });
@@ -167,28 +172,39 @@ test("portal/deleteMyRepresentations appends hash and returns data", async () =>
         axios,
         BASE_URL: "",
         consoleLogger: logger.consoleLogger,
-        hashAPIPath
+        hashAPIPath: () => "&hash=fallback"
     });
 
     const result = await portal.deleteMyRepresentations("rep-1");
 
     assert.deepStrictEqual(normalize(result), { removed: true });
-    assert.strictEqual(hashCalls.length, 1);
     assert.strictEqual(
-        hashCalls[0],
-        "/api/endpoint/deletemyrepresentations_api?myRepresentationsID=rep-1"
+        signCalls[0],
+        "/api/endpoint/gethash_api?path=%2Fapi%2Fendpoint%2Fdeletemyrepresentations_api%3FmyRepresentationsID%3Drep-1"
     );
     assert.strictEqual(
-        axios.calls[0].config.url,
+        axios.calls[0].url,
+        "/api/endpoint/gethash_api?path=%2Fapi%2Fendpoint%2Fdeletemyrepresentations_api%3FmyRepresentationsID%3Drep-1"
+    );
+    assert.strictEqual(
+        axios.calls[1].config.url,
         "/api/endpoint/deletemyrepresentations_api?myRepresentationsID=rep-1&hash=portal123"
     );
-    assert.strictEqual(axios.calls[0].config.method, "delete");
+    assert.strictEqual(axios.calls[1].config.method, "delete");
 });
 
 test("portal/deleteMyRepresentations logs and returns undefined on failure", async () => {
     const axios = createAxiosMock();
     const logger = createLoggerMock();
 
+    axios.getHandler = async (url) => {
+        if (url.startsWith("/api/endpoint/gethash_api?path=")) {
+            return { data: { hash: "&hash=portal-fail" } };
+        }
+
+        throw new Error("Unexpected get url: " + url);
+    };
+
     axios.requestHandler = async () =>
         Promise.reject(createAxiosError(401, "Unauthorized"));
 
@@ -196,7 +212,7 @@ test("portal/deleteMyRepresentations logs and returns undefined on failure", asy
         axios,
         BASE_URL: "",
         consoleLogger: logger.consoleLogger,
-        hashAPIPath: () => "&hash=portal-fail"
+        hashAPIPath: () => "&hash=fallback"
     });
 
     const result = await portal.deleteMyRepresentations("rep-2");
@@ -205,6 +221,87 @@ test("portal/deleteMyRepresentations logs and returns undefined on failure", asy
     assert.strictEqual(logger.calls.length, 1);
 });
 
+test("portal/deleteWatchedCases uses signer hash and returns data", async () => {
+    const axios = createAxiosMock();
+    const logger = createLoggerMock();
+    const signCalls = [];
+
+    axios.getHandler = async (url) => {
+        if (url.startsWith("/api/endpoint/gethash_api?path=")) {
+            signCalls.push(url);
+            return { data: { hash: "&hash=watch123" } };
+        }
+
+        throw new Error("Unexpected get url: " + url);
+    };
+
+    axios.requestHandler = async () => ({ data: { removed: true } });
+
+    const portal = loadServiceModule("portalDirectService.js", {
+        axios,
+        BASE_URL: "",
+        consoleLogger: logger.consoleLogger,
+        hashAPIPath: () => "&hash=fallback"
+    });
+
+    const result = await portal.deleteWatchedCases("watch-1");
+
+    assert.deepStrictEqual(normalize(result), { removed: true });
+    assert.strictEqual(
+        signCalls[0],
+        "/api/endpoint/gethash_api?path=%2Fapi%2Fendpoint%2Fdeletewatchedcases_api%3FwatchedCaseID%3Dwatch-1"
+    );
+    assert.strictEqual(
+        axios.calls[1].config.url,
+        "/api/endpoint/deletewatchedcases_api?watchedCaseID=watch-1&hash=watch123"
+    );
+});
+
+test("document delete blob flows use signer hash", async () => {
+    const axios = createAxiosMock();
+    const logger = createLoggerMock();
+    const signCalls = [];
+
+    axios.getHandler = async (url) => {
+        if (url.startsWith("/api/endpoint/gethash_api?path=")) {
+            signCalls.push(url);
+            return { data: { hash: "&hash=doc123" } };
+        }
+
+        throw new Error("Unexpected get url: " + url);
+    };
+
+    axios.requestHandler = async () => ({ data: { ok: true } });
+
+    const document = loadServiceModule("documentDirectService.js", {
+        axios,
+        BASE_URL: "",
+        consoleLogger: logger.consoleLogger,
+        hashAPIPath: () => "&hash=fallback"
+    });
+
+    const one = await document.deleteAwaitingSubmissionsFromBlob(
+        "c1",
+        "case-1"
+    );
+    const two = await document.deleteMyRepresentationsFromBlob(
+        "c1",
+        "case-1",
+        "rep-a"
+    );
+
+    assert.deepStrictEqual(normalize(one), { ok: true });
+    assert.deepStrictEqual(normalize(two), { ok: true });
+    assert.strictEqual(
+        signCalls[0],
+        "/api/endpoint/gethash_api?path=%2Fapi%2Ffile%2Fdeleteblobcase%3Fcontainer%3Dc1%26casefolderID%3Dcase-1"
+    );
+    assert.strictEqual(
+        signCalls[1],
+        "/api/endpoint/gethash_api?path=%2Fapi%2Ffile%2Fdeleteblobrep%3Fcontainer%3Dc1%26casefolderID%3Dcase-1%26repfile%3Drep-a"
+    );
+});
+
 test("account/getPortalLogin appends hash and returns res.data", async () => {
     const axios = createAxiosMock();
     const logger = createLoggerMock();