Initial working state: CL3.5 complete (Plesk sync + suspend/unsuspend)

app/api/stripe/portal/route.ts

@@ -0,0 +1,39 @@
+import { NextResponse } from "next/server";
+
+import { assertAgencyAdmin, getRouteAgencyContextOrThrow } from "@/lib/agency";
+import { env } from "@/lib/env";
+import { getStripeClient } from "@/lib/stripe";
+import { createSupabaseRouteClient } from "@/lib/supabase/route";
+
+export async function POST() {
+  try {
+    const context = await getRouteAgencyContextOrThrow();
+    assertAgencyAdmin(context);
+
+    const supabase = createSupabaseRouteClient();
+    const stripe = getStripeClient();
+
+    const { data: billing, error } = await supabase
+      .from("billing_accounts")
+      .select("stripe_customer_id")
+      .eq("agency_id", context.agencyId)
+      .maybeSingle();
+
+    if (error) throw error;
+    if (!billing?.stripe_customer_id) {
+      throw new Error("No Stripe customer is linked to this agency");
+    }
+
+    const session = await stripe.billingPortal.sessions.create({
+      customer: billing.stripe_customer_id,
+      return_url: `${env.appUrl}/dashboard`,
+    });
+
+    return NextResponse.json({ url: session.url });
+  } catch (error) {
+    return NextResponse.json(
+      { error: error instanceof Error ? error.message : "Failed to open billing portal" },
+      { status: 400 },
+    );
+  }
+}