diff --git a/frontend/components/account/__tests__/paymentShell.test.ts b/frontend/components/account/__tests__/paymentShell.test.ts
index 26f8bbe5..c8c7f46b 100644
--- a/frontend/components/account/__tests__/paymentShell.test.ts
+++ b/frontend/components/account/__tests__/paymentShell.test.ts
@@ -58,6 +58,10 @@ export function runTests() {
   const hookSource = fs.existsSync(hookPath)
     ? fs.readFileSync(hookPath, "utf8")
     : "";
+  const paymentFlowSource = fs.readFileSync(
+    path.join(accountDir, "usePaymentFlow.ts"),
+    "utf8",
+  );
   assert(
     (accountCenterSource.includes('import { usePaymentState } from "./usePaymentState";') ||
       hookSource.includes('import { usePaymentState } from "./usePaymentState";')) &&
@@ -327,4 +331,9 @@ export function runTests() {
     paymentRuntimeRouteSource.includes("includeSupabaseIdentity: false"),
     "payment runtime proxy must not read Supabase session cookies because backend entitlement token already protects the runtime status payload",
   );
+  assert(
+    (paymentFlowSource.match(/await buildAuthedHeaders\(true, true\);/g) || [])
+      .length >= 3,
+    "manual payment mutations must require a valid Supabase bearer token instead of forwarding unauthenticated requests that surface raw backend JSON",
+  );
 }
diff --git a/frontend/components/account/usePaymentFlow.ts b/frontend/components/account/usePaymentFlow.ts
index 0f571af2..32ef21ce 100644
--- a/frontend/components/account/usePaymentFlow.ts
+++ b/frontend/components/account/usePaymentFlow.ts
@@ -632,7 +632,7 @@ export function usePaymentFlow(params: UsePaymentFlowParams) {
 
     setPaymentBusy(true);
     try {
-      const authHeaders = await buildAuthedHeaders(true, false);
+      const authHeaders = await buildAuthedHeaders(true, true);
       const createRes = await fetch("/api/payments/intents", {
         method: "POST",
         headers: authHeaders,
@@ -704,7 +704,7 @@ export function usePaymentFlow(params: UsePaymentFlowParams) {
     setPaymentBusy(true);
     setPaymentError("");
     try {
-      const authHeaders = await buildAuthedHeaders(true, false);
+      const authHeaders = await buildAuthedHeaders(true, true);
       const submitRes = await fetch(`/api/payments/intents/${intentIdVal}/submit`, {
         method: "POST", headers: authHeaders, body: JSON.stringify({ tx_hash: txHashNorm }),
       });
@@ -762,7 +762,7 @@ export function usePaymentFlow(params: UsePaymentFlowParams) {
       }
       setTxValidation({ loading: true, checked: false });
       try {
-        const headers = await buildAuthedHeaders(true, false);
+        const headers = await buildAuthedHeaders(true, true);
         const res = await fetch(`/api/payments/intents/${intentId}/validate`, {
           method: "POST", headers, body: JSON.stringify({ tx_hash: hashNorm }),
         });