diff --git a/actions/clients/index.js b/actions/clients/index.js
index 3c9b8ee9..82af288e 100644
--- a/actions/clients/index.js
+++ b/actions/clients/index.js
@@ -2,3 +2,4 @@ export * from "./relayClient";
 export * from "./endpointClient";
 export * from "./fileClient";
 export * from "./fileRouteBuilder";
+export * from "./signedRequestClient";
diff --git a/actions/clients/signedRequestClient.js b/actions/clients/signedRequestClient.js
new file mode 100644
index 00000000..55aa6191
--- /dev/null
+++ b/actions/clients/signedRequestClient.js
@@ -0,0 +1,38 @@
+import { requestJson } from "./endpointClient";
+import { buildHashedQueryUrl } from "./relayClient";
+
+const signedRequestJson = async ({ method, queryUrl, data, config = {} }) => {
+    const signedUrl = await buildHashedQueryUrl(queryUrl);
+
+    return requestJson({
+        method,
+        url: signedUrl,
+        data,
+        ...config
+    });
+};
+
+export const getSignedJson = (queryUrl, config = {}) => {
+    return signedRequestJson({
+        method: "get",
+        queryUrl,
+        config
+    });
+};
+
+export const postSignedJson = (queryUrl, data, config = {}) => {
+    return signedRequestJson({
+        method: "post",
+        queryUrl,
+        data,
+        config
+    });
+};
+
+export const deleteSignedJson = (queryUrl, config = {}) => {
+    return signedRequestJson({
+        method: "delete",
+        queryUrl,
+        config
+    });
+};
diff --git a/actions/services/portalDirectService.js b/actions/services/portalDirectService.js
index 54b1eb92..d462f57f 100644
--- a/actions/services/portalDirectService.js
+++ b/actions/services/portalDirectService.js
@@ -2,6 +2,7 @@ import { BASE_URL } from "../core/env";
 import { consoleLogger } from "../core/logger";
 import { buildHashedQueryUrl } from "../clients/relayClient";
 import { getJson, requestJson } from "../clients/endpointClient";
+import { deleteSignedJson } from "../clients/signedRequestClient";
 import {
     buildFileQuery,
     withBaseUrl,
@@ -189,16 +190,9 @@ export const deleteWatchedCases = async (watchedCaseID) => {
         watchedCaseID
     });
 
-    return buildHashedQueryUrl(queryUrl)
-        .then((signedUrl) =>
-            requestJson({
-                method: "delete",
-                url: signedUrl
-            })
-        )
-        .catch((error) => {
-            consoleLogger(error);
-        });
+    return deleteSignedJson(queryUrl).catch((error) => {
+        consoleLogger(error);
+    });
 };
 
 export const sendCaseCompleteMessage = async (
diff --git a/memory-bank/change-log.md b/memory-bank/change-log.md
index 269a4093..3caa5361 100644
--- a/memory-bank/change-log.md
+++ b/memory-bank/change-log.md
@@ -2725,3 +2725,46 @@ Validation:
 Follow-ups:
 
 - Sequence A step3 targeted gaps are now covered; further test expansion should be treated as new scope (e.g., deeper end-to-end journey assertions).
+
+---
+
+### CL-076: TASK22269 Slice B1.1 — signed-request helper set + portal pilot signed-flow migration
+
+date: 2026-03-25
+author: Cline
+scope: `actions/clients/{signedRequestClient,index}.js`, `actions/services/portalDirectService.js`, `tests/{serviceHarness,phase22/portal-service-behaviour}.cjs`
+type: change
+rationale: Execute Sequence B Workstream B1 pilot by introducing shared signed request helpers (GET/POST/DELETE) and migrating one bounded portal signed flow without broader module rollout.
+impact: Reduces duplication and drift risk in hash-signing + method execution paths while preserving existing signed-flow behavior contracts.
+status: completed
+
+Summary:
+
+- Added new shared signed-request client helper module:
+    - `actions/clients/signedRequestClient.js`
+    - exports:
+        - `getSignedJson(queryUrl, config?)`
+        - `postSignedJson(queryUrl, data, config?)`
+        - `deleteSignedJson(queryUrl, config?)`
+    - all helpers use existing `buildHashedQueryUrl(...)` + `requestJson(...)` composition to preserve signing semantics
+- Exported new helper module via `actions/clients/index.js`.
+- Migrated exactly one pilot signed flow in portal service:
+    - `deleteWatchedCases` in `actions/services/portalDirectService.js`
+    - from inline `buildHashedQueryUrl(...).then(requestJson(...))` to `deleteSignedJson(queryUrl)`
+    - preserved existing catch/log behavior (`consoleLogger` + `undefined` return on catch)
+- Added test harness compatibility for VM import-stripping suites:
+    - `tests/serviceHarness.cjs` now injects default `deleteSignedJson` mock behavior.
+- Expanded portal behavioral tests with explicit negative-path assertion:
+    - `tests/phase22/portal-service-behaviour.test.cjs`
+    - verifies `deleteWatchedCases` logs and safely returns `undefined` when signed delete fails.
+
+Validation:
+
+- `npm run lint` -> pass with warnings only (pre-existing `react-hooks/exhaustive-deps`; no new lint errors)
+- `node tests/phase22/index.test.cjs` -> pass
+    - portal-service suite now 5/5 including signed-delete failure path
+- `node tests/phase7/service-behaviour.test.cjs` -> pass (13/13)
+
+Follow-ups:
+
+- Continue Sequence B B1 in future bounded slices by migrating additional signed flows one module/function cluster at a time (outside this slice).
diff --git a/tests/phase22/portal-service-behaviour.test.cjs b/tests/phase22/portal-service-behaviour.test.cjs
index f1f33b4b..cc386e80 100644
--- a/tests/phase22/portal-service-behaviour.test.cjs
+++ b/tests/phase22/portal-service-behaviour.test.cjs
@@ -134,6 +134,27 @@ test("portal/sendRepCompleteMessage rejects when hash signing fails before reque
     assert.strictEqual(logger.calls.length, 0);
 });
 
+test("portal/deleteWatchedCases logs and returns undefined when signed delete fails", async () => {
+    const axios = createAxiosMock();
+    const logger = createLoggerMock();
+    const error = createAxiosError(401, "Unauthorized");
+
+    const portal = loadServiceModule("portalDirectService.js", {
+        axios,
+        BASE_URL: "",
+        consoleLogger: logger.consoleLogger,
+        deleteSignedJson: async () => {
+            throw error;
+        }
+    });
+
+    const result = await portal.deleteWatchedCases("watch-2");
+
+    assert.strictEqual(result, undefined);
+    assert.strictEqual(logger.calls.length, 1);
+    assert.strictEqual(logger.calls[0], error);
+});
+
 const run = async () => {
     let passed = 0;
 
diff --git a/tests/serviceHarness.cjs b/tests/serviceHarness.cjs
index 4cf494ff..c73a4961 100644
--- a/tests/serviceHarness.cjs
+++ b/tests/serviceHarness.cjs
@@ -126,6 +126,18 @@ const loadServiceModule = (fileName, injected = {}) => {
         });
     };
 
+    const defaultDeleteSignedJson = async (queryUrl, config = {}) => {
+        const hashedUrl = await (
+            injected.buildHashedQueryUrl || defaultBuildHashedQueryUrl
+        )(queryUrl);
+
+        return (injected.requestJson || defaultRequestJson)({
+            method: "delete",
+            url: hashedUrl,
+            ...config
+        });
+    };
+
     const defaultBuildFileQuery = (pathValue, params = {}, options = {}) => {
         const { encode = false } = options;
         const entries = Object.entries(params).filter(([, value]) => {
@@ -172,6 +184,7 @@ const loadServiceModule = (fileName, injected = {}) => {
         getSignedFileJson:
             injected.getSignedFileJson || defaultGetSignedFileJson,
         downloadFileBlob: injected.downloadFileBlob || defaultDownloadFileBlob,
+        deleteSignedJson: injected.deleteSignedJson || defaultDeleteSignedJson,
         buildHashedQueryUrl:
             injected.buildHashedQueryUrl || defaultBuildHashedQueryUrl,
         buildFileQuery: injected.buildFileQuery || defaultBuildFileQuery,