diff --git a/background/steps/create-plus-checkout.js b/background/steps/create-plus-checkout.js
index 6e5d150..905e874 100644
--- a/background/steps/create-plus-checkout.js
+++ b/background/steps/create-plus-checkout.js
@@ -210,13 +210,42 @@
       return Number.isFinite(numeric) ? Math.max(0, Math.floor(numeric)) : null;
     }
 
-    function isGpcAutoModeEnabled(payload = {}) {
-      const rootScope = typeof self !== 'undefined' ? self : globalThis;
-      if (rootScope.GoPayUtils?.isGpcAutoModeEnabled) {
-        return rootScope.GoPayUtils.isGpcAutoModeEnabled(payload);
+    function normalizeGpcAutoModePermissionValue(value) {
+      if (typeof value === 'boolean') {
+        return value;
       }
+      if (typeof value === 'number') {
+        if (value === 1) return true;
+        if (value === 0) return false;
+      }
+      const normalized = String(value ?? '').trim().toLowerCase();
+      if (!normalized) {
+        return null;
+      }
+      if (['true', '1', 'yes', 'y', 'on', 'enabled', 'enable'].includes(normalized)) {
+        return true;
+      }
+      if (['false', '0', 'no', 'n', 'off', 'disabled', 'disable'].includes(normalized)) {
+        return false;
+      }
+      return null;
+    }
+
+    function getGpcAutoModePermission(payload = {}) {
       const data = unwrapGpcResponse(payload);
-      return data?.auto_mode_enabled === true || data?.autoModeEnabled === true;
+      if (!data || typeof data !== 'object' || Array.isArray(data)) {
+        return null;
+      }
+      return normalizeGpcAutoModePermissionValue(
+        data.auto_mode_enabled
+        ?? data.autoModeEnabled
+        ?? data.auto_enabled
+        ?? data.autoEnabled
+      );
+    }
+
+    function isGpcAutoModePermissionDenied(payload = {}) {
+      return getGpcAutoModePermission(payload) === false;
     }
 
     async function assertGpcApiKeyReadyForCreate(state = {}, phoneMode = GPC_HELPER_PHONE_MODE_MANUAL, apiKey = '') {
@@ -244,7 +273,7 @@
       if (remainingUses !== null && remainingUses <= 0) {
         throw new Error('创建 GPC 订单失败：API Key 剩余次数不足。');
       }
-      if (phoneMode === GPC_HELPER_PHONE_MODE_AUTO && !isGpcAutoModeEnabled(balanceData)) {
+      if (phoneMode === GPC_HELPER_PHONE_MODE_AUTO && isGpcAutoModePermissionDenied(balanceData)) {
         throw new Error('创建 GPC 订单失败：当前 GPC API Key 未开通自动模式。');
       }
     }
diff --git a/sidepanel/sidepanel.js b/sidepanel/sidepanel.js
index 2760ce9..d32e7e0 100644
--- a/sidepanel/sidepanel.js
+++ b/sidepanel/sidepanel.js
@@ -2167,22 +2167,55 @@ function getGpcHelperAutoModeEnabled(state = latestState) {
   return Boolean(state?.gopayHelperAutoModeEnabled);
 }
 
-function hasGpcAutoModePermissionField(payload = {}) {
-  if (!payload || typeof payload !== 'object' || Array.isArray(payload)) {
+function normalizeGpcAutoModePermissionValue(value) {
+  if (typeof value === 'boolean') {
+    return value;
+  }
+  if (typeof value === 'number') {
+    if (value === 1) return true;
+    if (value === 0) return false;
+  }
+  const normalized = String(value ?? '').trim().toLowerCase();
+  if (!normalized) {
+    return null;
+  }
+  if (['true', '1', 'yes', 'y', 'on', 'enabled', 'enable'].includes(normalized)) {
+    return true;
+  }
+  if (['false', '0', 'no', 'n', 'off', 'disabled', 'disable'].includes(normalized)) {
     return false;
   }
-  return payload.auto_mode_enabled !== undefined
-    || payload.autoModeEnabled !== undefined
-    || payload.auto_enabled !== undefined
-    || payload.autoEnabled !== undefined
-    || (payload.data && typeof payload.data === 'object' && !Array.isArray(payload.data) && hasGpcAutoModePermissionField(payload.data));
+  return null;
+}
+
+function getGpcAutoModePermissionFromPayload(payload = {}) {
+  if (!payload || typeof payload !== 'object' || Array.isArray(payload)) {
+    return null;
+  }
+  for (const key of ['auto_mode_enabled', 'autoModeEnabled', 'auto_enabled', 'autoEnabled']) {
+    if (payload[key] !== undefined) {
+      return normalizeGpcAutoModePermissionValue(payload[key]);
+    }
+  }
+  if (payload.data && typeof payload.data === 'object' && !Array.isArray(payload.data)) {
+    return getGpcAutoModePermissionFromPayload(payload.data);
+  }
+  return null;
+}
+
+function shouldPreserveSelectedGpcAutoMode(state = latestState) {
+  const payloadPermission = getGpcAutoModePermissionFromPayload(state?.gopayHelperBalancePayload);
+  return normalizeGpcHelperPhoneModeValue(state?.gopayHelperPhoneMode) === GPC_HELPER_PHONE_MODE_AUTO
+    && (Boolean(state?.gopayHelperAutoModeEnabled) || payloadPermission === true);
+}
+
+function hasGpcAutoModePermissionField(payload = {}) {
+  return getGpcAutoModePermissionFromPayload(payload) !== null;
 }
 
 function isGpcAutoModePermissionDenied(state = latestState) {
-  if (getGpcHelperAutoModeEnabled(state)) {
-    return false;
-  }
-  return hasGpcAutoModePermissionField(state?.gopayHelperBalancePayload);
+  const payloadPermission = getGpcAutoModePermissionFromPayload(state?.gopayHelperBalancePayload);
+  return payloadPermission === false;
 }
 
 function normalizeGpcRemainingUsesValue(value) {
@@ -3389,7 +3422,10 @@ function collectSettingsPayload() {
       ? selectGpcHelperPhoneMode.value
       : (latestState?.gopayHelperPhoneMode || 'manual')
   );
-  const effectiveGpcPhoneMode = (typeof isGpcAutoModePermissionDenied === 'function' && isGpcAutoModePermissionDenied(latestState))
+  const preserveSelectedGpcAutoMode = typeof shouldPreserveSelectedGpcAutoMode === 'function'
+    ? shouldPreserveSelectedGpcAutoMode(latestState)
+    : false;
+  const effectiveGpcPhoneMode = (!preserveSelectedGpcAutoMode && typeof isGpcAutoModePermissionDenied === 'function' && isGpcAutoModePermissionDenied(latestState))
     ? 'manual'
     : selectedGpcPhoneMode;
   const selectedGpcOtpChannel = normalizeGpcOtpChannelSafe(
@@ -7370,7 +7406,11 @@ function updatePlusModeUI() {
   );
   const gpcAutoModeDenied = isGpcAutoModePermissionDenied(latestState);
   const gpcAutoModeEnabled = getGpcHelperAutoModeEnabled(latestState);
-  const isGpcAutoMode = !gpcAutoModeDenied && gpcPhoneMode === GPC_HELPER_PHONE_MODE_AUTO;
+  const preserveSelectedGpcAutoMode = typeof shouldPreserveSelectedGpcAutoMode === 'function'
+    ? shouldPreserveSelectedGpcAutoMode(latestState)
+    : false;
+  const effectiveGpcAutoModeDenied = gpcAutoModeDenied && !preserveSelectedGpcAutoMode;
+  const isGpcAutoMode = !effectiveGpcAutoModeDenied && gpcPhoneMode === GPC_HELPER_PHONE_MODE_AUTO;
   const gpcOtpChannel = normalizeGpcOtpChannelValue(
     typeof selectGpcHelperOtpChannel !== 'undefined' && selectGpcHelperOtpChannel
       ? selectGpcHelperOtpChannel.value
@@ -7385,7 +7425,7 @@ function updatePlusModeUI() {
     ? normalizePlusPaymentMethod(selectPlusPaymentMethod.value)
     : method;
   const gpcRowsVisible = enabled && selectedMethod === gpcValue;
-  const canShowGpcModeSelector = gpcRowsVisible && (gpcAutoModeEnabled || !gpcAutoModeDenied);
+  const canShowGpcModeSelector = gpcRowsVisible && (gpcAutoModeEnabled || !effectiveGpcAutoModeDenied);
   const localSmsControlsVisible = gpcRowsVisible && !isGpcAutoMode;
   const effectiveLocalSmsEnabled = !isGpcAutoMode && localSmsEnabled;
   if (typeof selectPlusPaymentMethod !== 'undefined' && selectPlusPaymentMethod) {
@@ -7430,7 +7470,7 @@ function updatePlusModeUI() {
     rowGpcHelperPhoneMode.style.display = canShowGpcModeSelector ? '' : 'none';
   }
   if (typeof selectGpcHelperPhoneMode !== 'undefined' && selectGpcHelperPhoneMode) {
-    selectGpcHelperPhoneMode.value = gpcAutoModeDenied ? GPC_HELPER_PHONE_MODE_MANUAL : gpcPhoneMode;
+    selectGpcHelperPhoneMode.value = effectiveGpcAutoModeDenied ? GPC_HELPER_PHONE_MODE_MANUAL : gpcPhoneMode;
   }
   [
     typeof rowGpcHelperCountryCode !== 'undefined' ? rowGpcHelperCountryCode : null,
@@ -7735,7 +7775,7 @@ async function ensureGpcApiKeyReadyForStart(options = {}) {
     return false;
   }
 
-  if (selectedMode === GPC_HELPER_PHONE_MODE_AUTO && !balanceState.gopayHelperAutoModeEnabled) {
+  if (selectedMode === GPC_HELPER_PHONE_MODE_AUTO && isGpcAutoModePermissionDenied(balanceState)) {
     if (typeof selectGpcHelperPhoneMode !== 'undefined' && selectGpcHelperPhoneMode) {
       selectGpcHelperPhoneMode.value = GPC_HELPER_PHONE_MODE_MANUAL;
     }
@@ -11765,14 +11805,22 @@ btnGpcHelperBalance?.addEventListener('click', async () => {
       gopayHelperAutoModeEnabled: getGpcAutoModeEnabledFromResponse(response),
       gopayHelperApiKeyStatus: response?.apiKeyStatus || response?.data?.status || response?.payload?.data?.status || response?.payload?.status || '',
     };
+    const nextAutoModePermission = getGpcAutoModePermissionFromPayload(nextState.gopayHelperBalancePayload);
+    const nextAutoModeDenied = nextAutoModePermission === false;
+    const nextAutoModeConfirmed = nextAutoModePermission === true || nextState.gopayHelperAutoModeEnabled;
+    const selectedModeBeforeBalanceState = getSelectedGpcHelperPhoneMode();
     syncLatestState(nextState);
-    if (!nextState.gopayHelperAutoModeEnabled && getSelectedGpcHelperPhoneMode() === GPC_HELPER_PHONE_MODE_AUTO) {
+    if (nextAutoModeDenied && selectedModeBeforeBalanceState === GPC_HELPER_PHONE_MODE_AUTO) {
       selectGpcHelperPhoneMode.value = GPC_HELPER_PHONE_MODE_MANUAL;
       syncLatestState({ gopayHelperPhoneMode: GPC_HELPER_PHONE_MODE_MANUAL });
       await saveSettings({ silent: true, force: true }).catch(() => {});
       showToast('当前 API Key 未开通自动模式，已切回手动模式。', 'warn');
+    } else if (nextAutoModeDenied) {
+      showToast('GPC 余额已更新，当前 API Key 只能使用手动模式。', 'success');
+    } else if (nextAutoModeConfirmed) {
+      showToast('GPC 余额已更新，自动模式可用。', 'success');
     } else {
-      showToast(nextState.gopayHelperAutoModeEnabled ? 'GPC 余额已更新，自动模式可用。' : 'GPC 余额已更新，当前 API Key 只能使用手动模式。', 'success');
+      showToast('GPC 余额已更新，当前接口未返回自动模式权限，已保留所选模式。', 'success');
     }
     updatePlusModeUI();
   } catch (error) {
@@ -13728,7 +13776,9 @@ chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
       if (message.payload.gopayHelperPhoneMode !== undefined && selectGpcHelperPhoneMode) {
         selectGpcHelperPhoneMode.value = normalizeGpcHelperPhoneModeValue(message.payload.gopayHelperPhoneMode);
       }
-      if (message.payload.gopayHelperAutoModeEnabled === false && selectGpcHelperPhoneMode?.value === GPC_HELPER_PHONE_MODE_AUTO) {
+      if (message.payload.gopayHelperAutoModeEnabled === false
+        && selectGpcHelperPhoneMode?.value === GPC_HELPER_PHONE_MODE_AUTO
+        && isGpcAutoModePermissionDenied(latestState)) {
         selectGpcHelperPhoneMode.value = GPC_HELPER_PHONE_MODE_MANUAL;
         syncLatestState({ gopayHelperPhoneMode: GPC_HELPER_PHONE_MODE_MANUAL });
         showToast('当前 API Key 未开通自动模式，已切回手动模式。', 'warn', 2200);
diff --git a/tests/plus-checkout-create-wait.test.js b/tests/plus-checkout-create-wait.test.js
index 9b3d01a..6c13520 100644
--- a/tests/plus-checkout-create-wait.test.js
+++ b/tests/plus-checkout-create-wait.test.js
@@ -510,6 +510,63 @@ test('GPC auto checkout only sends access token and API Key', async () => {
   assert.equal(events.find((event) => event.type === 'complete')?.step, 6);
 });
 
+test('GPC auto checkout keeps running when balance payload omits auto mode permission', async () => {
+  const events = [];
+  const fetchCalls = [];
+  const executor = api.createPlusCheckoutCreateExecutor({
+    addLog: async () => {},
+    chrome: {
+      tabs: {
+        create: async () => {
+          throw new Error('should not open token tab when direct access token exists');
+        },
+        remove: async () => {},
+      },
+    },
+    completeStepFromBackground: async (step, payload) => events.push({ type: 'complete', step, payload }),
+    ensureContentScriptReadyOnTabUntilStopped: async () => {},
+    fetch: async (url, options = {}) => {
+      fetchCalls.push({ url, options });
+      return {
+        ok: true,
+        status: 200,
+        json: async () => url.endsWith('/api/gp/balance')
+          ? createGpcBalanceResponse({ auto_mode_enabled: undefined, remaining_uses: 998 })
+          : createGpcTaskResponse({
+              task_id: 'task_auto_unknown_permission',
+              status: 'queued',
+              status_text: '排队中',
+              phone_mode: 'auto',
+              api_waiting_for: '',
+            }),
+      };
+    },
+    registerTab: async () => {},
+    sendTabMessageUntilStopped: async () => ({}),
+    setState: async (payload) => events.push({ type: 'set-state', payload }),
+    sleepWithStop: async () => {},
+    waitForTabCompleteUntilStopped: async () => {},
+  });
+
+  await executor.executePlusCheckoutCreate({
+    plusPaymentMethod: 'gpc-helper',
+    gopayHelperPhoneMode: 'auto',
+    gopayHelperApiUrl: 'https://gpc.qlhazycoder.top/',
+    chatgptAccessToken: 'state-access-token',
+    gopayHelperApiKey: 'gpc_auto_123',
+  });
+
+  assert.equal(fetchCalls.length, 2);
+  assert.equal(fetchCalls[0].url, 'https://gpc.qlhazycoder.top/api/gp/balance');
+  assert.equal(fetchCalls[1].url, 'https://gpc.qlhazycoder.top/api/gp/tasks');
+  const helperPayload = JSON.parse(fetchCalls[1].options.body);
+  assert.equal(helperPayload.phone_mode, 'auto');
+  const statePayload = events.find((event) => event.type === 'set-state')?.payload || {};
+  assert.equal(statePayload.gopayHelperTaskId, 'task_auto_unknown_permission');
+  assert.equal(statePayload.gopayHelperPhoneMode, 'auto');
+  assert.equal(events.find((event) => event.type === 'complete')?.step, 6);
+});
+
 test('GPC auto checkout blocks API Keys without auto mode permission', async () => {
   const fetchCalls = [];
   const executor = api.createPlusCheckoutCreateExecutor({
diff --git a/tests/sidepanel-plus-payment-method.test.js b/tests/sidepanel-plus-payment-method.test.js
index ecf00ef..fdd8e6d 100644
--- a/tests/sidepanel-plus-payment-method.test.js
+++ b/tests/sidepanel-plus-payment-method.test.js
@@ -134,6 +134,9 @@ test('sidepanel Plus UI hides PayPal account selector while GoPay is selected',
     extractFunction('getSelectedPlusPaymentMethod'),
     extractFunction('normalizeGpcHelperPhoneModeValue'),
     extractFunction('getGpcHelperAutoModeEnabled'),
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('shouldPreserveSelectedGpcAutoMode'),
     extractFunction('hasGpcAutoModePermissionField'),
     extractFunction('isGpcAutoModePermissionDenied'),
     extractFunction('normalizeGpcOtpChannelValue'),
@@ -217,6 +220,9 @@ test('sidepanel Plus UI shows GPC fields and purchase button only for GPC', () =
     extractFunction('getSelectedPlusPaymentMethod'),
     extractFunction('normalizeGpcHelperPhoneModeValue'),
     extractFunction('getGpcHelperAutoModeEnabled'),
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('shouldPreserveSelectedGpcAutoMode'),
     extractFunction('hasGpcAutoModePermissionField'),
     extractFunction('isGpcAutoModePermissionDenied'),
     extractFunction('normalizeGpcOtpChannelValue'),
@@ -310,6 +316,9 @@ test('sidepanel hides GPC auto mode selector when API Key has no auto permission
     extractFunction('getSelectedPlusPaymentMethod'),
     extractFunction('normalizeGpcHelperPhoneModeValue'),
     extractFunction('getGpcHelperAutoModeEnabled'),
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('shouldPreserveSelectedGpcAutoMode'),
     extractFunction('hasGpcAutoModePermissionField'),
     extractFunction('isGpcAutoModePermissionDenied'),
     extractFunction('normalizeGpcOtpChannelValue'),
@@ -353,12 +362,104 @@ return { updatePlusModeUI, selectGpcHelperPhoneMode, plusPaymentMethodCaption, r
   assert.match(api.plusPaymentMethodCaption.textContent, /手动/);
 });
 
+test('sidepanel keeps selected GPC auto mode when persisted permission survives stop refresh', () => {
+  const bundle = [
+    extractFunction('normalizePlusPaymentMethod'),
+    extractFunction('getSelectedPlusPaymentMethod'),
+    extractFunction('normalizeGpcHelperPhoneModeValue'),
+    extractFunction('getGpcHelperAutoModeEnabled'),
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('shouldPreserveSelectedGpcAutoMode'),
+    extractFunction('hasGpcAutoModePermissionField'),
+    extractFunction('isGpcAutoModePermissionDenied'),
+    extractFunction('normalizeGpcOtpChannelValue'),
+    extractFunction('updatePlusModeUI'),
+  ].join('\n');
+
+  const api = new Function(`
+let latestState = {
+  plusPaymentMethod: 'gpc-helper',
+  gopayHelperPhoneMode: 'auto',
+  gopayHelperAutoModeEnabled: true,
+  gopayHelperBalancePayload: { auto_mode_enabled: true },
+};
+let currentPlusPaymentMethod = 'gpc-helper';
+const inputPlusModeEnabled = { checked: true };
+const selectPlusPaymentMethod = { value: 'gpc-helper', style: { display: 'none' } };
+const GPC_HELPER_PHONE_MODE_AUTO = 'auto';
+const GPC_HELPER_PHONE_MODE_MANUAL = 'manual';
+const plusPaymentMethodCaption = { textContent: '' };
+const rowPayPalAccount = { style: { display: '' } };
+const rowPlusPaymentMethod = { style: { display: 'none' } };
+const rowGpcHelperApi = { style: { display: 'none' } };
+const rowGpcHelperCardKey = { style: { display: 'none' } };
+const rowGpcHelperPhoneMode = { style: { display: 'none' } };
+const selectGpcHelperPhoneMode = { value: 'auto' };
+const rowGpcHelperCountryCode = { style: { display: 'none' } };
+const rowGpcHelperPhone = { style: { display: 'none' } };
+const rowGpcHelperOtpChannel = { style: { display: 'none' } };
+const selectGpcHelperOtpChannel = { value: 'whatsapp' };
+const rowGpcHelperLocalSmsEnabled = { style: { display: 'none' } };
+const inputGpcHelperLocalSmsEnabled = { checked: false };
+const rowGpcHelperLocalSmsUrl = { style: { display: 'none' } };
+const rowGpcHelperPin = { style: { display: 'none' } };
+${bundle}
+function syncLatestState(nextState) { latestState = { ...latestState, ...nextState }; }
+return {
+  updatePlusModeUI,
+  selectGpcHelperPhoneMode,
+  getSelectedPhoneMode() { return selectGpcHelperPhoneMode.value; },
+  getPayloadPhoneMode() {
+    return (() => {
+      const selectedGpcPhoneMode = normalizeGpcHelperPhoneModeValue(selectGpcHelperPhoneMode.value);
+      const preserveSelectedGpcAutoMode = shouldPreserveSelectedGpcAutoMode(latestState);
+      return (!preserveSelectedGpcAutoMode && isGpcAutoModePermissionDenied(latestState)) ? 'manual' : selectedGpcPhoneMode;
+    })();
+  },
+  applyDataUpdated(payload) {
+    syncLatestState(payload);
+    if (payload.gopayHelperPhoneMode !== undefined) {
+      selectGpcHelperPhoneMode.value = normalizeGpcHelperPhoneModeValue(payload.gopayHelperPhoneMode);
+    }
+    if (payload.gopayHelperAutoModeEnabled === false
+      && selectGpcHelperPhoneMode?.value === GPC_HELPER_PHONE_MODE_AUTO
+      && isGpcAutoModePermissionDenied(latestState)) {
+      selectGpcHelperPhoneMode.value = GPC_HELPER_PHONE_MODE_MANUAL;
+      syncLatestState({ gopayHelperPhoneMode: GPC_HELPER_PHONE_MODE_MANUAL });
+    }
+    updatePlusModeUI();
+  },
+  rows: { rowGpcHelperPhoneMode, rowGpcHelperPhone, rowGpcHelperOtpChannel, rowGpcHelperPin },
+};
+`)();
+
+  api.updatePlusModeUI();
+  assert.equal(api.getSelectedPhoneMode(), 'auto');
+  assert.equal(api.getPayloadPhoneMode(), 'auto');
+  assert.equal(api.rows.rowGpcHelperPhoneMode.style.display, '');
+  assert.equal(api.rows.rowGpcHelperPhone.style.display, 'none');
+
+  api.applyDataUpdated({
+    autoRunning: false,
+    autoRunPhase: 'stopped',
+    gopayHelperAutoModeEnabled: false,
+  });
+
+  assert.equal(api.getSelectedPhoneMode(), 'auto');
+  assert.equal(api.getPayloadPhoneMode(), 'auto');
+  assert.equal(api.rows.rowGpcHelperPhone.style.display, 'none');
+});
+
 test('sidepanel keeps selected GPC auto mode before permission has been queried', () => {
   const bundle = [
     extractFunction('normalizePlusPaymentMethod'),
     extractFunction('getSelectedPlusPaymentMethod'),
     extractFunction('normalizeGpcHelperPhoneModeValue'),
     extractFunction('getGpcHelperAutoModeEnabled'),
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('shouldPreserveSelectedGpcAutoMode'),
     extractFunction('hasGpcAutoModePermissionField'),
     extractFunction('isGpcAutoModePermissionDenied'),
     extractFunction('normalizeGpcOtpChannelValue'),
@@ -401,6 +502,70 @@ return { updatePlusModeUI, selectGpcHelperPhoneMode, plusPaymentMethodCaption, r
   assert.match(api.plusPaymentMethodCaption.textContent, /自动/);
 });
 
+test('sidepanel start check keeps GPC auto mode when balance payload omits permission field', async () => {
+  const bundle = [
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('isGpcAutoModePermissionDenied'),
+    extractFunction('normalizeGpcRemainingUsesValue'),
+    extractFunction('ensureGpcApiKeyReadyForStart'),
+  ].join('\n');
+
+  const api = new Function(`
+let latestState = { gopayHelperPhoneMode: 'auto' };
+const GPC_HELPER_PHONE_MODE_AUTO = 'auto';
+const GPC_HELPER_PHONE_MODE_MANUAL = 'manual';
+const selectGpcHelperPhoneMode = { value: 'auto' };
+const dialogs = [];
+let saveCalls = 0;
+let updateCalls = 0;
+${bundle}
+function isGpcHelperCheckoutSelected() { return true; }
+function getSelectedGpcHelperPhoneMode() { return selectGpcHelperPhoneMode.value; }
+async function refreshGpcBalanceForStart() {
+  return {
+    gopayHelperRemainingUses: 998,
+    gopayHelperApiKeyStatus: 'active',
+    gopayHelperAutoModeEnabled: false,
+    gopayHelperBalancePayload: {
+      status: 'active',
+      remaining_uses: 998,
+    },
+  };
+}
+async function showGpcStartBlockedDialog(message) {
+  dialogs.push(message);
+}
+function syncLatestState(nextState) {
+  latestState = { ...latestState, ...nextState };
+}
+function updatePlusModeUI() {
+  updateCalls += 1;
+}
+async function saveSettings() {
+  saveCalls += 1;
+}
+function showToast() {}
+return {
+  ensureGpcApiKeyReadyForStart,
+  selectGpcHelperPhoneMode,
+  getDialogs: () => dialogs.slice(),
+  getSaveCalls: () => saveCalls,
+  getUpdateCalls: () => updateCalls,
+  getPersistedPhoneMode: () => latestState.gopayHelperPhoneMode,
+};
+`)();
+
+  const allowed = await api.ensureGpcApiKeyReadyForStart();
+
+  assert.equal(allowed, true);
+  assert.equal(api.selectGpcHelperPhoneMode.value, 'auto');
+  assert.equal(api.getPersistedPhoneMode(), 'auto');
+  assert.equal(api.getSaveCalls(), 0);
+  assert.equal(api.getUpdateCalls(), 0);
+  assert.deepEqual(api.getDialogs(), []);
+});
+
 test('sidepanel resolves pending GoPay manual confirmation from DATA_UPDATED state', async () => {
   const bundle = [
     extractFunction('openPlusManualConfirmationDialog'),