(function attachBackgroundPlusCheckoutBilling(root, factory) {
  root.MultiPageBackgroundPlusCheckoutBilling = factory();
})(typeof self !== 'undefined' ? self : globalThis, function createBackgroundPlusCheckoutBillingModule() {
  const PLUS_CHECKOUT_SOURCE = 'plus-checkout';
  const PLUS_CHECKOUT_INJECT_FILES = ['content/utils.js', 'content/plus-checkout.js'];
  const PLUS_CHECKOUT_URL_PATTERN = /^https:\/\/chatgpt\.com\/checkout(?:\/|$)/i;
  const PLUS_CHECKOUT_FRAME_READY_DELAY_MS = 500;
  const PLUS_CHECKOUT_SUBMIT_MAX_ATTEMPTS = 3;
  const PLUS_CHECKOUT_PAYPAL_REDIRECT_TIMEOUT_MS = 20000;
  const PLUS_PAYMENT_METHOD_PAYPAL = 'paypal';
  const PLUS_PAYMENT_METHOD_GOPAY = 'gopay';
  const PLUS_PAYMENT_METHOD_GPC_HELPER = 'gpc-helper';
  const DEFAULT_GPC_HELPER_API_URL = 'https://gopay.hwork.pro';
  const PAYMENT_METHOD_CONFIGS = {
    [PLUS_PAYMENT_METHOD_PAYPAL]: {
      id: PLUS_PAYMENT_METHOD_PAYPAL,
      label: 'PayPal',
      selectMessageType: 'PLUS_CHECKOUT_SELECT_PAYPAL',
      redirectPattern: /paypal\./i,
    },
    [PLUS_PAYMENT_METHOD_GOPAY]: {
      id: PLUS_PAYMENT_METHOD_GOPAY,
      label: 'GoPay',
      selectMessageType: 'PLUS_CHECKOUT_SELECT_GOPAY',
      redirectPattern: /gopay|gojek|midtrans|xendit|stripe|checkout/i,
    },
  };
  const MEIGUODIZHI_ADDRESS_ENDPOINT = 'https://www.meiguodizhi.com/api/v1/dz';
  const MEIGUODIZHI_COUNTRY_CONFIG = {
    AR: { path: '/ar-address', city: 'Buenos Aires', aliases: ['ar', 'argentina', '阿根廷'] },
    AU: { path: '/au-address', city: 'Sydney', aliases: ['au', 'aus', 'australia', '澳大利亚'] },
    CA: { path: '/ca-address', city: 'Toronto', aliases: ['ca', 'canada', '加拿大'] },
    CN: { path: '/cn-address', city: 'Shanghai', aliases: ['cn', 'china', '中国'] },
    DE: { path: '/de-address', city: 'Berlin', aliases: ['de', 'deu', 'germany', 'deutschland', '德国'] },
    ES: { path: '/es-address', city: 'Madrid', aliases: ['es', 'esp', 'spain', '西班牙'] },
    FR: { path: '/fr-address', city: 'Paris', aliases: ['fr', 'fra', 'france', '法国'] },
    GB: { path: '/uk-address', city: 'London', aliases: ['gb', 'uk', 'united kingdom', 'britain', 'england', '英国'] },
    HK: { path: '/hk-address', city: 'Hong Kong', aliases: ['hk', 'hong kong', '香港'] },
    ID: { path: '/id-address', city: 'Jakarta', aliases: ['id', 'indonesia', '印度尼西亚', '印尼'] },
    IT: { path: '/it-address', city: 'Rome', aliases: ['it', 'ita', 'italy', '意大利'] },
    JP: { path: '/jp-address', city: 'Tokyo', aliases: ['jp', 'jpn', 'japan', '日本', '日本国'] },
    KR: { path: '/kr-address', city: 'Seoul', aliases: ['kr', 'kor', 'korea', 'south korea', '韩国'] },
    MY: { path: '/my-address', city: 'Kuala Lumpur', aliases: ['my', 'malaysia', '马来西亚'] },
    NL: { path: '/nl-address', city: 'Amsterdam', aliases: ['nl', 'netherlands', 'holland', '荷兰'] },
    PH: { path: '/ph-address', city: 'Manila', aliases: ['ph', 'philippines', '菲律宾'] },
    RU: { path: '/ru-address', city: 'Moscow', aliases: ['ru', 'russia', '俄罗斯'] },
    SG: { path: '/sg-address', city: 'Singapore', aliases: ['sg', 'singapore', '新加坡'] },
    TH: { path: '/th-address', city: 'Bangkok', aliases: ['th', 'thailand', '泰国'] },
    TR: { path: '/tr-address', city: 'Istanbul', aliases: ['tr', 'turkey', 'turkiye', '土耳其'] },
    TW: { path: '/tw-address', city: 'Taipei', aliases: ['tw', 'taiwan', '台湾'] },
    US: { path: '/', city: 'New York', aliases: ['us', 'usa', 'united states', 'united states of america', 'america', '美国'] },
    VN: { path: '/vn-address', city: 'Ho Chi Minh City', aliases: ['vn', 'vietnam', '越南'] },
  };

  function createPlusCheckoutBillingExecutor(deps = {}) {
    const {
      addLog,
      broadcastDataUpdate,
      chrome,
      completeStepFromBackground,
      ensureContentScriptReadyOnTabUntilStopped,
      fetch: fetchImpl = null,
      generateRandomName,
      getAddressSeedForCountry,
      getState,
      getTabId,
      isTabAlive,
      markCurrentRegistrationAccountUsed,
      setState,
      sleepWithStop,
      waitForTabCompleteUntilStopped,
      probeIpProxyExit = null,
      throwIfStopped = () => {},
    } = deps;

    function isPlusCheckoutUrl(url = '') {
      return PLUS_CHECKOUT_URL_PATTERN.test(String(url || ''));
    }

    function normalizeText(value = '') {
      return String(value || '').replace(/\s+/g, ' ').trim();
    }

    function isGpcHelperCheckout(state = {}) {
      return normalizePlusPaymentMethod(state?.plusPaymentMethod) === PLUS_PAYMENT_METHOD_GPC_HELPER
        || (normalizeText(state?.plusCheckoutSource) === PLUS_PAYMENT_METHOD_GPC_HELPER
          && Boolean(state?.gopayHelperReferenceId));
    }

    function compactCountryText(value = '') {
      return normalizeText(value).toLowerCase().replace(/[^a-z0-9\u4e00-\u9fff]/g, '');
    }

    function normalizePlusPaymentMethod(value = '') {
      const rootScope = typeof self !== 'undefined' ? self : globalThis;
      if (rootScope.GoPayUtils?.normalizePlusPaymentMethod) {
        return rootScope.GoPayUtils.normalizePlusPaymentMethod(value);
      }
      const normalized = String(value || '').trim().toLowerCase();
      if (normalized === PLUS_PAYMENT_METHOD_GPC_HELPER) {
        return PLUS_PAYMENT_METHOD_GPC_HELPER;
      }
      return normalized === PLUS_PAYMENT_METHOD_GOPAY ? PLUS_PAYMENT_METHOD_GOPAY : PLUS_PAYMENT_METHOD_PAYPAL;
    }

    function getPaymentMethodConfig(method = PLUS_PAYMENT_METHOD_PAYPAL) {
      return PAYMENT_METHOD_CONFIGS[normalizePlusPaymentMethod(method)] || PAYMENT_METHOD_CONFIGS[PLUS_PAYMENT_METHOD_PAYPAL];
    }

    function normalizeGpcHelperBaseUrl(apiUrl = '') {
      const rootScope = typeof self !== 'undefined' ? self : globalThis;
      if (rootScope.GoPayUtils?.normalizeGpcHelperBaseUrl) {
        return rootScope.GoPayUtils.normalizeGpcHelperBaseUrl(apiUrl);
      }
      let normalized = String(apiUrl || DEFAULT_GPC_HELPER_API_URL).trim().replace(/\/+$/g, '');
      normalized = normalized.replace(/\/api\/checkout\/start$/i, '');
      normalized = normalized.replace(/\/api\/gopay\/(?:otp|pin)$/i, '');
      normalized = normalized.replace(/\/api\/card\/balance(?:\?.*)?$/i, '');
      return normalized || DEFAULT_GPC_HELPER_API_URL;
    }

    async function fetchJsonWithTimeout(url, options = {}, timeoutMs = 30000) {
      const fetcher = typeof fetchImpl === 'function'
        ? fetchImpl
        : (typeof fetch === 'function' ? fetch.bind(globalThis) : null);
      if (typeof fetcher !== 'function') {
        throw new Error('当前运行环境不支持 fetch，无法调用 GPC API。');
      }
      const controller = typeof AbortController === 'function' ? new AbortController() : null;
      const timer = controller ? setTimeout(() => controller.abort(), Math.max(1000, Number(timeoutMs) || 30000)) : null;
      try {
        const response = await fetcher(url, { ...options, ...(controller ? { signal: controller.signal } : {}) });
        const data = await response.json().catch(() => ({}));
        return { response, data };
      } finally {
        if (timer) clearTimeout(timer);
      }
    }

    function buildGpcOtpPayload(input = {}) {
      const rootScope = typeof self !== 'undefined' ? self : globalThis;
      if (rootScope.GoPayUtils?.buildGpcOtpPayload) {
        return rootScope.GoPayUtils.buildGpcOtpPayload(input);
      }
      const payload = {
        reference_id: String(input.reference_id ?? input.referenceId ?? '').trim(),
        otp: String(input.otp ?? input.code ?? '').trim().replace(/[^\d]/g, ''),
        card_key: String(input.card_key ?? input.cardKey ?? '').trim(),
      };
      const gopayGuid = String(input.gopay_guid ?? input.gopayGuid ?? '').trim();
      const redirectUrl = String(input.redirect_url ?? input.redirectUrl ?? '').trim();
      const flowId = String(input.flow_id ?? input.flowId ?? '').trim();
      if (flowId) payload.flow_id = flowId;
      if (gopayGuid) payload.gopay_guid = gopayGuid;
      if (redirectUrl) payload.redirect_url = redirectUrl;
      return payload;
    }

    function buildGpcOtpRetryPayload(input = {}) {
      const rootScope = typeof self !== 'undefined' ? self : globalThis;
      if (rootScope.GoPayUtils?.buildGpcOtpRetryPayload) {
        return rootScope.GoPayUtils.buildGpcOtpRetryPayload(input);
      }
      const basePayload = buildGpcOtpPayload(input);
      return { ...basePayload, code: basePayload.otp };
    }

    function buildGpcPinPayload(input = {}) {
      const rootScope = typeof self !== 'undefined' ? self : globalThis;
      if (rootScope.GoPayUtils?.buildGpcPinPayload) {
        return rootScope.GoPayUtils.buildGpcPinPayload(input);
      }
      const payload = {
        reference_id: String(input.reference_id ?? input.referenceId ?? '').trim(),
        challenge_id: String(input.challenge_id ?? input.challengeId ?? '').trim(),
        gopay_guid: String(input.gopay_guid ?? input.gopayGuid ?? '').trim(),
        pin: String(input.pin ?? '').trim().replace(/[^\d]/g, ''),
        card_key: String(input.card_key ?? input.cardKey ?? '').trim(),
      };
      const redirectUrl = String(input.redirect_url ?? input.redirectUrl ?? '').trim();
      const flowId = String(input.flow_id ?? input.flowId ?? '').trim();
      if (flowId) payload.flow_id = flowId;
      if (redirectUrl) payload.redirect_url = redirectUrl;
      return payload;
    }

    function buildGpcPinRetryPayload(input = {}) {
      const rootScope = typeof self !== 'undefined' ? self : globalThis;
      if (rootScope.GoPayUtils?.buildGpcPinRetryPayload) {
        return rootScope.GoPayUtils.buildGpcPinRetryPayload(input);
      }
      const basePayload = buildGpcPinPayload(input);
      return { ...basePayload, challengeId: basePayload.challenge_id };
    }

    function getGpcResponseErrorDetail(payload = {}, status = 0) {
      const rootScope = typeof self !== 'undefined' ? self : globalThis;
      if (rootScope.GoPayUtils?.extractGpcResponseErrorDetail) {
        return rootScope.GoPayUtils.extractGpcResponseErrorDetail(payload, status);
      }
      if (payload && typeof payload === 'object') {
        return payload.detail || payload.message || payload.error || payload.error_description || payload.reason || `HTTP ${status || 0}`;
      }
      return `HTTP ${status || 0}`;
    }

    async function postGpcJsonWithFallback(apiUrl, endpointPath, primaryPayload, fallbackPayload, timeoutMs = 30000) {
      const requestUrl = `${apiUrl}${endpointPath}`;
      const send = (payload) => fetchJsonWithTimeout(requestUrl, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(payload),
      }, timeoutMs);
      const firstResponse = await send(primaryPayload);
      if (firstResponse?.response?.ok || !fallbackPayload) {
        return { ...firstResponse, retried: false, payload: primaryPayload };
      }
      const status = Number(firstResponse?.response?.status || 0);
      if (status !== 400 && status !== 422) {
        return { ...firstResponse, retried: false, payload: primaryPayload };
      }
      const firstDetail = getGpcResponseErrorDetail(firstResponse?.data, status);
      await addLog(`步骤 7：GPC 接口返回 ${status}（${firstDetail}），使用兼容字段重试。`, 'warn');
      const secondResponse = await send(fallbackPayload);
      return {
        ...secondResponse,
        retried: true,
        payload: fallbackPayload,
        firstError: firstDetail,
        firstStatus: status,
      };
    }

    function getStateInternal() {
      if (typeof getState === 'function') {
        return getState();
      }
      return Promise.resolve({});
    }

    async function requestGpcOtpInput({ title = '', message = '', referenceId = '' }) {
      const requestId = `otp-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
      const payload = {
        plusManualConfirmationPending: true,
        plusManualConfirmationRequestId: requestId,
        plusManualConfirmationStep: 7,
        plusManualConfirmationMethod: 'gopay-otp',
        plusManualConfirmationTitle: title || 'GPC OTP 验证',
        plusManualConfirmationMessage: message || '请输入 OTP 验证码',
        gopayHelperOtpRequestId: requestId,
        gopayHelperOtpReferenceId: referenceId,
        gopayHelperResolvedOtp: '',
      };
      await setState(payload);
      if (typeof broadcastDataUpdate === 'function') {
        broadcastDataUpdate(payload);
      }
      return new Promise((resolve, reject) => {
        const checkInterval = setInterval(async () => {
          try {
            throwIfStopped();
            const currentState = await getStateInternal();
            if (!currentState?.plusManualConfirmationPending || currentState?.plusManualConfirmationRequestId !== requestId) {
              clearInterval(checkInterval);
              const resolvedOtp = String(currentState?.gopayHelperResolvedOtp || '').trim().replace(/[^\d]/g, '');
              if (resolvedOtp) {
                resolve(resolvedOtp);
              } else {
                reject(new Error('OTP 输入已取消'));
              }
            }
          } catch (error) {
            clearInterval(checkInterval);
            reject(error);
          }
        }, 500);
      });
    }

    async function executeGpcHelperBilling(state = {}) {
      const referenceId = String(state?.gopayHelperReferenceId || '').trim();
      const apiUrl = normalizeGpcHelperBaseUrl(state?.gopayHelperApiUrl || '');
      const cardKey = String(state?.gopayHelperCardKey || state?.gpcCardKey || state?.cardKey || '').trim();
      if (!referenceId) {
        throw new Error('步骤 7：GPC 模式缺少 reference_id，请先执行步骤 6。');
      }
      if (!apiUrl) {
        throw new Error('步骤 7：GPC 模式缺少 API 地址。');
      }
      if (!cardKey) {
        throw new Error('步骤 7：GPC 模式缺少卡密。');
      }
      await addLog(`步骤 7：GPC 模式开始 OTP 验证（reference_id: ${referenceId}）...`, 'info');
      await addLog('步骤 7：等待用户输入 OTP...', 'info');
      const otp = await requestGpcOtpInput({
        title: 'GPC OTP 验证',
        message: `请输入收到的 OTP 验证码（reference_id: ${referenceId}）`,
        referenceId,
      });

      const flowId = state?.gopayHelperFlowId
        || state?.gopayHelperStartPayload?.flow_id
        || state?.gopayHelperStartPayload?.flowId
        || state?.gopayHelperBalancePayload?.flow_id
        || state?.gopayHelperBalancePayload?.flowId
        || '';
      const baseInput = {
        reference_id: referenceId,
        otp,
        card_key: cardKey,
        gopay_guid: state?.gopayHelperGoPayGuid || '',
        redirect_url: state?.gopayHelperRedirectUrl || '',
        flow_id: flowId,
      };
      await addLog('步骤 7：正在提交 OTP...', 'info');
      const otpResponse = await postGpcJsonWithFallback(
        apiUrl,
        '/api/gopay/otp',
        buildGpcOtpPayload(baseInput),
        buildGpcOtpRetryPayload(baseInput),
        30000
      );
      if (!otpResponse?.response?.ok) {
        throw new Error(`步骤 7：OTP 验证失败：${getGpcResponseErrorDetail(otpResponse?.data, otpResponse?.response?.status || 0)}`);
      }

      const otpData = otpResponse?.data || {};
      const challengeId = String(
        otpData?.challenge_id
        || otpData?.challengeId
        || state?.gopayHelperChallengeId
        || state?.gopayHelperStartPayload?.challenge_id
        || state?.gopayHelperStartPayload?.challengeId
        || ''
      ).trim();
      const nextFlowId = String(otpData?.flow_id || otpData?.flowId || baseInput.flow_id || '').trim();
      const gopayGuid = String(otpData?.gopay_guid || otpData?.gopayGuid || state?.gopayHelperGoPayGuid || '').trim();
      const redirectUrl = String(otpData?.redirect_url || otpData?.redirectUrl || state?.gopayHelperRedirectUrl || '').trim();
      if (!challengeId) {
        throw new Error('步骤 7：GPC OTP 验证后未返回 challenge_id。');
      }
      const pin = String(state?.gopayHelperPin || '').trim().replace(/[^\d]/g, '');
      if (!pin) {
        throw new Error('步骤 7：GPC 模式缺少 PIN 配置。');
      }

      await setState({
        gopayHelperChallengeId: challengeId,
        gopayHelperFlowId: nextFlowId,
        gopayHelperGoPayGuid: gopayGuid,
        gopayHelperRedirectUrl: redirectUrl,
      });

      await addLog('步骤 7：正在提交 PIN...', 'info');
      const pinInput = {
        reference_id: referenceId,
        challenge_id: challengeId,
        gopay_guid: gopayGuid,
        redirect_url: redirectUrl,
        flow_id: nextFlowId,
        pin,
        card_key: cardKey,
      };
      const pinResponse = await postGpcJsonWithFallback(
        apiUrl,
        '/api/gopay/pin',
        buildGpcPinPayload(pinInput),
        buildGpcPinRetryPayload(pinInput),
        30000
      );
      if (!pinResponse?.response?.ok) {
        throw new Error(`步骤 7：PIN 验证失败：${getGpcResponseErrorDetail(pinResponse?.data, pinResponse?.response?.status || 0)}`);
      }

      await setState({
        plusCheckoutSource: PLUS_PAYMENT_METHOD_GPC_HELPER,
        gopayHelperPinPayload: pinResponse?.data || null,
      });
      await addLog('步骤 7：GPC 支付完成，准备继续下一步。', 'ok');
      await completeStepFromBackground(7, {
        plusCheckoutSource: PLUS_PAYMENT_METHOD_GPC_HELPER,
      });
    }

    function resolveMeiguodizhiCountryCode(value = '') {
      const normalized = normalizeText(value);
      const upper = normalized.toUpperCase();
      if (MEIGUODIZHI_COUNTRY_CONFIG[upper]) {
        return upper;
      }
      const compact = compactCountryText(normalized);
      const match = Object.entries(MEIGUODIZHI_COUNTRY_CONFIG).find(([code, config]) => (
        compact === code.toLowerCase()
        || (config.aliases || []).some((alias) => {
          const compactAlias = compactCountryText(alias);
          return compact === compactAlias || (compactAlias.length >= 4 && compact.includes(compactAlias));
        })
      ));
      return match?.[0] || '';
    }

    function hasCompleteAddressFallback(seed) {
      const fallback = seed?.fallback || {};
      return Boolean(
        normalizeText(fallback.address1)
        && normalizeText(fallback.city)
        && normalizeText(fallback.postalCode)
      );
    }

    function normalizePostalCodeForCountry(countryCode, rawPostalCode = '', fallbackPostalCode = '') {
      const normalizedCountry = resolveMeiguodizhiCountryCode(countryCode) || normalizeText(countryCode).toUpperCase();
      const postalCode = normalizeText(rawPostalCode);
      const fallback = normalizeText(fallbackPostalCode);
      if (normalizedCountry !== 'KR') {
        return postalCode;
      }
      if (/^\d{5}$/.test(postalCode)) {
        return postalCode;
      }
      if (/^\d{5}$/.test(fallback)) {
        return fallback;
      }
      return '04524';
    }

    function buildDirectAddressSeed(countryCode, apiAddress, fallbackSeed) {
      const address1 = normalizeText(apiAddress?.Trans_Address || apiAddress?.Address);
      const city = normalizeText(apiAddress?.City);
      const region = normalizeText(apiAddress?.State_Full || apiAddress?.State);
      const postalCode = normalizePostalCodeForCountry(
        countryCode,
        apiAddress?.Zip_Code,
        fallbackSeed?.fallback?.postalCode
      );
      if (!address1 || !city || !postalCode) {
        return null;
      }
      return {
        ...(fallbackSeed || {}),
        countryCode,
        query: [address1, city].filter(Boolean).join(', '),
        source: 'meiguodizhi',
        skipAutocomplete: true,
        fallback: {
          ...(fallbackSeed?.fallback || {}),
          address1,
          city,
          region,
          postalCode,
        },
      };
    }

    async function fetchMeiguodizhiAddressSeed(countryCode, fallbackSeed) {
      if (typeof fetchImpl !== 'function') {
        return null;
      }
      const countryConfig = MEIGUODIZHI_COUNTRY_CONFIG[countryCode];
      if (!countryConfig?.path) {
        return null;
      }
      const path = countryConfig.path;
      const city = normalizeText(fallbackSeed?.fallback?.city || fallbackSeed?.query || countryConfig.city);
      const response = await fetchImpl(MEIGUODIZHI_ADDRESS_ENDPOINT, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          city,
          path,
          method: 'refresh',
        }),
      });
      if (!response?.ok) {
        throw new Error(`HTTP ${response?.status || 0}`);
      }
      const data = await response.json();
      if (data?.status !== 'ok') {
        throw new Error(data?.message || data?.status || 'unknown response');
      }
      return buildDirectAddressSeed(countryCode, data.address || {}, fallbackSeed);
    }

    function getLocalAddressSeed(countryCode) {
      if (typeof getAddressSeedForCountry !== 'function') {
        return null;
      }
      const seed = getAddressSeedForCountry(countryCode, {
        fallbackCountry: 'DE',
      });
      return seed?.countryCode === countryCode ? seed : null;
    }

    function buildMeiguodizhiLookupSeed(countryCode) {
      const config = MEIGUODIZHI_COUNTRY_CONFIG[countryCode];
      if (!config) {
        return null;
      }
      return {
        countryCode,
        query: config.city,
        fallback: {
          address1: '',
          city: config.city,
          region: '',
          postalCode: '',
        },
      };
    }

    function resolveBillingAddressCountry(state = {}, countryOverride = '', paymentMethod = PLUS_PAYMENT_METHOD_PAYPAL) {
      const normalizedPaymentMethod = normalizePlusPaymentMethod(paymentMethod || state?.plusPaymentMethod);
      const checkoutCountry = resolveMeiguodizhiCountryCode(countryOverride);
      const savedCheckoutCountry = resolveMeiguodizhiCountryCode(state.plusCheckoutCountry);
      const exitCountry = resolveMeiguodizhiCountryCode(
        state.ipProxyAppliedExitRegion
        || state.ipProxyExitRegion
        || ''
      );

      if (normalizedPaymentMethod === PLUS_PAYMENT_METHOD_GOPAY) {
        const countryCode = exitCountry || checkoutCountry || savedCheckoutCountry || 'ID';
        return {
          countryCode,
          requestedCountry: exitCountry
            || normalizeText(countryOverride)
            || normalizeText(state.plusCheckoutCountry)
            || 'ID',
          source: exitCountry ? 'proxy_exit' : (checkoutCountry ? 'checkout_page' : (savedCheckoutCountry ? 'checkout_state' : 'gopay_fallback')),
        };
      }

      const countryCode = checkoutCountry || savedCheckoutCountry || exitCountry || 'DE';
      return {
        countryCode,
        requestedCountry: normalizeText(countryOverride)
          || normalizeText(state.plusCheckoutCountry)
          || exitCountry
          || 'DE',
        source: checkoutCountry ? 'checkout_page' : (savedCheckoutCountry ? 'checkout_state' : (exitCountry ? 'proxy_exit' : 'paypal_fallback')),
      };
    }

    async function resolveBillingAddressSeed(state = {}, countryOverride = '', options = {}) {
      const paymentMethod = normalizePlusPaymentMethod(options.paymentMethod || state?.plusPaymentMethod);
      const countryResolution = resolveBillingAddressCountry(state, countryOverride, paymentMethod);
      const countryCode = countryResolution.countryCode;
      const requestedCountry = countryResolution.requestedCountry;
      if (paymentMethod === PLUS_PAYMENT_METHOD_GOPAY && countryResolution.source === 'proxy_exit') {
        await addLog(`步骤 7：GoPay 账单地址将按当前代理出口地区 ${countryCode} 填写。`, 'info');
      }
      const localSeed = getLocalAddressSeed(countryCode);
      const lookupSeed = localSeed || buildMeiguodizhiLookupSeed(countryCode);
      if (!lookupSeed) {
        throw new Error(`步骤 7：无法识别账单国家或地区：${requestedCountry || '空'}`);
      }
      try {
        const remoteSeed = await fetchMeiguodizhiAddressSeed(countryCode, lookupSeed);
        if (hasCompleteAddressFallback(remoteSeed)) {
          await addLog(
            `步骤 7：已从 meiguodizhi 接口获取账单地址（${remoteSeed.fallback.city} / ${remoteSeed.fallback.postalCode}），将跳过 Google 地址推荐。`,
            'info'
          );
          return remoteSeed;
        }
        await addLog('步骤 7：meiguodizhi 接口返回的地址字段不完整，回退到本地地址种子。', 'warn');
      } catch (error) {
        await addLog(`步骤 7：meiguodizhi 地址接口不可用，回退到本地地址种子：${error?.message || String(error || '')}`, 'warn');
      }

      if (hasCompleteAddressFallback(localSeed)) {
        return localSeed;
      }
      throw new Error(`步骤 7：${requestedCountry} 的 meiguodizhi 地址不可用，且没有本地兜底地址。`);
    }

    async function getAlivePlusCheckoutTabId(tabId) {
      if (!Number.isInteger(tabId) || tabId <= 0) {
        return null;
      }
      if (!chrome?.tabs?.get) {
        return tabId;
      }
      const tab = await chrome.tabs.get(tabId).catch(() => null);
      return tab && isPlusCheckoutUrl(tab.url) ? tabId : null;
    }

    async function getCurrentPlusCheckoutTabId() {
      if (!chrome?.tabs?.query) {
        return null;
      }

      const activeTabs = await chrome.tabs.query({ active: true, currentWindow: true }).catch(() => []);
      const activeCheckoutTab = activeTabs.find((tab) => Number.isInteger(tab?.id) && isPlusCheckoutUrl(tab.url));
      if (activeCheckoutTab) {
        return activeCheckoutTab.id;
      }

      const checkoutTabs = await chrome.tabs.query({ url: 'https://chatgpt.com/checkout/*' }).catch(() => []);
      const checkoutTab = checkoutTabs.find((tab) => Number.isInteger(tab?.id) && isPlusCheckoutUrl(tab.url));
      return checkoutTab?.id || null;
    }

    async function getCheckoutFrames(tabId) {
      if (!chrome?.webNavigation?.getAllFrames) {
        return [{ frameId: 0, url: '' }];
      }
      const frames = await chrome.webNavigation.getAllFrames({ tabId }).catch(() => null);
      if (!Array.isArray(frames) || !frames.length) {
        return [{ frameId: 0, url: '' }];
      }
      return frames
        .filter((frame) => Number.isInteger(frame?.frameId))
        .sort((left, right) => Number(left.frameId) - Number(right.frameId));
    }

    async function pingCheckoutFrame(tabId, frameId) {
      try {
        const pong = await chrome.tabs.sendMessage(tabId, {
          type: 'PING',
          source: 'background',
          payload: {},
        }, {
          frameId: Number.isInteger(frameId) ? frameId : 0,
        });
        return Boolean(pong?.ok && (!pong.source || pong.source === PLUS_CHECKOUT_SOURCE));
      } catch {
        return false;
      }
    }

    async function ensurePlusCheckoutFrameReady(tabId, frameId) {
      if (await pingCheckoutFrame(tabId, frameId)) {
        return true;
      }
      if (!chrome?.scripting?.executeScript) {
        return false;
      }

      try {
        await chrome.scripting.executeScript({
          target: { tabId, frameIds: [frameId] },
          func: (injectedSource) => {
            window.__MULTIPAGE_SOURCE = injectedSource;
          },
          args: [PLUS_CHECKOUT_SOURCE],
        });
        await chrome.scripting.executeScript({
          target: { tabId, frameIds: [frameId] },
          files: PLUS_CHECKOUT_INJECT_FILES,
        });
      } catch {
        // If the frame was already injected or navigated mid-injection, ping once more below.
      }

      await sleepWithStop(PLUS_CHECKOUT_FRAME_READY_DELAY_MS);
      return await pingCheckoutFrame(tabId, frameId);
    }

    async function ensurePlusCheckoutFramesReady(tabId, frames) {
      const checkedFrames = [];
      for (const frame of frames) {
        const ready = await ensurePlusCheckoutFrameReady(tabId, frame.frameId);
        checkedFrames.push({ ...frame, ready });
      }
      return checkedFrames;
    }

    async function sendFrameMessage(tabId, frameId, message) {
      return chrome.tabs.sendMessage(tabId, message, {
        frameId: Number.isInteger(frameId) ? frameId : 0,
      });
    }

    async function waitForPaymentRedirectAfterSubmit(tabId, paymentMethod = PLUS_PAYMENT_METHOD_PAYPAL) {
      const paymentConfig = getPaymentMethodConfig(paymentMethod);
      const startedAt = Date.now();
      while (Date.now() - startedAt < PLUS_CHECKOUT_PAYPAL_REDIRECT_TIMEOUT_MS) {
        const tab = await chrome.tabs.get(tabId).catch(() => null);
        if (!tab) {
          throw new Error(`步骤 7：checkout 标签页已关闭，无法继续等待 ${paymentConfig.label} 跳转。`);
        }
        const url = String(tab.url || '');
        if (paymentConfig.redirectPattern.test(url) && !isPlusCheckoutUrl(url)) {
          await waitForTabCompleteUntilStopped(tabId);
          await sleepWithStop(1000);
          return true;
        }
        if (url && !isPlusCheckoutUrl(url)) {
          await addLog(`步骤 7：点击订阅后页面跳转到非 ${paymentConfig.label} 识别地址：${url}`, 'warn');
          return false;
        }
        await sleepWithStop(500);
      }
      return false;
    }

    async function waitForPayPalRedirectAfterSubmit(tabId) {
      return waitForPaymentRedirectAfterSubmit(tabId, PLUS_PAYMENT_METHOD_PAYPAL);
    }

    async function inspectCheckoutFrame(tabId, frame) {
      try {
        const result = await sendFrameMessage(tabId, frame.frameId, {
          type: 'PLUS_CHECKOUT_GET_STATE',
          source: 'background',
          payload: {},
        });
        if (result?.error) {
          return { frame, error: result.error };
        }
        return { frame: { ...frame, ready: true }, result: result || {} };
      } catch (error) {
        const readyError = frame.ready === false ? 'content-script-not-ready' : '';
        const message = error?.message || String(error || '');
        return { frame, error: readyError ? `${readyError}: ${message}` : message };
      }
    }

    function isPaymentFrameUrl(url = '') {
      return /elements-inner-payment|componentName=payment/i.test(String(url || ''));
    }

    function isAddressFrameUrl(url = '') {
      return /elements-inner-address|componentName=address/i.test(String(url || ''));
    }

    function isAutocompleteFrameUrl(url = '') {
      return /elements-inner-autocompl/i.test(String(url || ''));
    }

    function buildFrameSummary(inspections) {
      return inspections
        .map((item) => {
          const flags = [];
          if (item.result?.hasPayPal) flags.push('paypal');
          if (item.result?.hasGoPay) flags.push('gopay');
          if (item.result?.billingFieldsVisible) flags.push('billing');
          if (item.result?.hasSubscribeButton) flags.push('subscribe');
          if (!flags.length && item.error) flags.push(item.error);
          if (!flags.length) flags.push('no-match');
          return `${item.frame.frameId}:${item.frame.url || 'about:blank'}:${flags.join(',')}`;
        })
        .slice(0, 8)
        .join(' | ');
    }

    async function inspectCheckoutFrames(tabId, frames) {
      const inspections = [];
      for (const frame of frames) {
        const inspection = await inspectCheckoutFrame(tabId, frame);
        inspections.push(inspection);
      }
      return inspections;
    }

    function pickPaymentFrame(inspections, paymentMethod = PLUS_PAYMENT_METHOD_PAYPAL) {
      const normalizedPaymentMethod = normalizePlusPaymentMethod(paymentMethod);
      if (normalizedPaymentMethod === PLUS_PAYMENT_METHOD_GOPAY) {
        return inspections.find((item) => item.result?.hasGoPay || item.result?.gopayCandidates?.length)
          || inspections.find((item) => isPaymentFrameUrl(item.frame.url))
          || null;
      }
      return inspections.find((item) => item.result?.hasPayPal || item.result?.paypalCandidates?.length)
        || inspections.find((item) => isPaymentFrameUrl(item.frame.url))
        || null;
    }

    function pickBillingFrame(inspections) {
      return inspections.find((item) => item.result?.billingFieldsVisible)
        || inspections.find((item) => isAddressFrameUrl(item.frame.url))
        || null;
    }

    function pickSubscribeFrame(inspections) {
      return inspections.find((item) => item.result?.hasSubscribeButton)
        || inspections.find((item) => item.frame.frameId === 0)
        || null;
    }

    function findCheckoutAmountInspection(inspections = []) {
      return inspections.find((item) => item.result?.checkoutAmountSummary?.hasTodayDue)
        || null;
    }

    async function inspectCheckoutAmountSummary(tabId) {
      const frames = await getReadyCheckoutFrames(tabId);
      const inspections = await inspectCheckoutFrames(tabId, frames);
      const amountInspection = findCheckoutAmountInspection(inspections);
      return amountInspection?.result?.checkoutAmountSummary || null;
    }

    async function ensureFreeTrialAmount(tabId, state = {}, options = {}) {
      const phaseLabel = String(options.phaseLabel || '').trim() || '提交前';
      const amountSummary = await inspectCheckoutAmountSummary(tabId);
      if (!amountSummary?.hasTodayDue) {
        await addLog(`步骤 7：${phaseLabel}未能识别 checkout 的“今日应付金额”，为避免误判将继续执行。`, 'warn');
        return;
      }

      if (amountSummary.isZero) {
        await addLog(`步骤 7：${phaseLabel}已确认今日应付金额为 ${amountSummary.rawAmount || '0'}，继续执行。`, 'ok');
        return;
      }

      const amountLabel = amountSummary.rawAmount || (
        Number.isFinite(Number(amountSummary.amount)) ? String(amountSummary.amount) : '未知金额'
      );
      await addLog(`步骤 7：${phaseLabel}检测到今日应付金额不是 0（${amountLabel}），说明当前账号没有免费试用资格，将跳过支付提交。`, 'warn');
      if (typeof markCurrentRegistrationAccountUsed === 'function') {
        await markCurrentRegistrationAccountUsed(state, {
          reason: 'plus-checkout-non-free-trial',
          logPrefix: 'Plus Checkout：当前账号没有免费试用资格',
        });
      }
      throw new Error(`PLUS_CHECKOUT_NON_FREE_TRIAL::步骤 7：今日应付金额不是 0（${amountLabel}），当前账号没有免费试用资格，已跳过支付提交。`);
    }

    async function getReadyCheckoutFrames(tabId) {
      return ensurePlusCheckoutFramesReady(tabId, await getCheckoutFrames(tabId));
    }

    async function resolveOptionalFrameByUrl(tabId, predicate) {
      const frames = await getCheckoutFrames(tabId);
      const frame = frames.find((item) => predicate(item.url));
      if (!frame) {
        return null;
      }
      const ready = await ensurePlusCheckoutFrameReady(tabId, frame.frameId);
      return {
        frame,
        ready,
      };
    }

    async function resolvePaymentFrame(tabId, frames, paymentMethod = PLUS_PAYMENT_METHOD_PAYPAL) {
      const inspections = await inspectCheckoutFrames(tabId, frames);
      const picked = pickPaymentFrame(inspections, paymentMethod);
      if (picked) {
        return {
          frameId: picked.frame.frameId,
          frameUrl: picked.frame.url || '',
          ready: picked.frame.ready !== false,
          inspections,
        };
      }

      return {
        frameId: null,
        frameUrl: '',
        inspections,
      };
    }

    async function waitForBillingFrame(tabId) {
      while (true) {
        const frames = await getReadyCheckoutFrames(tabId);
        const inspections = await inspectCheckoutFrames(tabId, frames);
        const picked = pickBillingFrame(inspections);
        if (picked) {
          return {
            frameId: picked.frame.frameId,
            frameUrl: picked.frame.url || '',
            countryText: picked.result?.countryText || '',
            ready: picked.frame.ready !== false,
            inspections,
          };
        }
        await sleepWithStop(250);
      }
    }

    async function waitForSubscribeFrame(tabId, candidateFrames) {
      const frames = candidateFrames.length ? candidateFrames : [{ frameId: 0, url: '' }];
      while (true) {
        const readyFrames = await ensurePlusCheckoutFramesReady(tabId, frames);
        const inspections = await inspectCheckoutFrames(tabId, readyFrames);
        const picked = pickSubscribeFrame(inspections);
        if (picked) {
          return picked.frame;
        }
        await sleepWithStop(250);
      }
    }

    async function getCheckoutTabId(state = {}) {
      const registeredTabId = await getTabId(PLUS_CHECKOUT_SOURCE);
      if (registeredTabId && await isTabAlive(PLUS_CHECKOUT_SOURCE)) {
        const aliveRegisteredTabId = await getAlivePlusCheckoutTabId(registeredTabId);
        if (aliveRegisteredTabId) {
          return aliveRegisteredTabId;
        }
      }
      const storedTabId = Number(state.plusCheckoutTabId) || 0;
      if (storedTabId) {
        const aliveStoredTabId = await getAlivePlusCheckoutTabId(storedTabId);
        if (aliveStoredTabId) {
          return aliveStoredTabId;
        }
      }
      const currentCheckoutTabId = await getCurrentPlusCheckoutTabId();
      if (currentCheckoutTabId) {
        await addLog('步骤 7：检测到当前已在 Plus Checkout 页面，直接接管当前标签页。', 'info');
        return currentCheckoutTabId;
      }
      throw new Error('步骤 7：未找到 Plus Checkout 标签页。请先打开 Plus Checkout 页面，或完成步骤 6。');
    }

    async function executePlusCheckoutBilling(state = {}) {
      if (isGpcHelperCheckout(state)) {
        await executeGpcHelperBilling(state);
        return;
      }
      const paymentMethod = normalizePlusPaymentMethod(state?.plusPaymentMethod);
      const paymentConfig = getPaymentMethodConfig(paymentMethod);
      const tabId = await getCheckoutTabId(state);
      await addLog('步骤 7：正在等待 Plus Checkout 页面加载完成...', 'info');
      await waitForTabCompleteUntilStopped(tabId);
      await sleepWithStop(1000);

      await ensureContentScriptReadyOnTabUntilStopped(PLUS_CHECKOUT_SOURCE, tabId, {
        inject: PLUS_CHECKOUT_INJECT_FILES,
        injectSource: PLUS_CHECKOUT_SOURCE,
        logMessage: '步骤 7：Checkout 页面仍在加载，等待账单填写脚本就绪...',
      });
      const readyFrames = await getReadyCheckoutFrames(tabId);
      await ensureFreeTrialAmount(tabId, state, {
        phaseLabel: 'Checkout 页面加载后',
      });
      const paymentFrame = await resolvePaymentFrame(tabId, readyFrames, paymentMethod);
      if (paymentFrame.frameId === null) {
        const frameSummary = buildFrameSummary(paymentFrame.inspections);
        throw new Error(`步骤 7：未在主页面或 iframe 中发现 ${paymentConfig.label} DOM，无法自动切换付款方式。frame 摘要：${frameSummary}`);
      }
      if (!paymentFrame.ready) {
        throw new Error(`步骤 7：已定位到 ${paymentConfig.label} 所在 iframe（frameId=${paymentFrame.frameId}），但账单脚本无法注入该 iframe。请提供该 iframe 的控制台结构或截图。`);
      }

      if (paymentFrame.frameId !== 0) {
        await addLog(`步骤 7：${paymentConfig.label} 位于 checkout iframe（frameId=${paymentFrame.frameId}），将改为在该 frame 内操作。`, 'info');
      }

      const randomName = generateRandomName();
      const fullName = [randomName.firstName, randomName.lastName].filter(Boolean).join(' ');

      await addLog(`步骤 7：正在切换 ${paymentConfig.label} 付款方式...`, 'info');
      const paymentResult = await sendFrameMessage(tabId, paymentFrame.frameId, {
        type: paymentConfig.selectMessageType,
        source: 'background',
        payload: { paymentMethod },
      });
      if (paymentResult?.error) {
        throw new Error(paymentResult.error);
      }

      const billingFrame = await waitForBillingFrame(tabId);
      if (!billingFrame.ready) {
        throw new Error(`步骤 7：已定位到账单地址 iframe（frameId=${billingFrame.frameId}），但账单脚本无法注入该 iframe。请提供该 iframe 的控制台结构或截图。`);
      }
      if (billingFrame.frameId !== paymentFrame.frameId) {
        await addLog(`步骤 7：账单地址位于 checkout iframe（frameId=${billingFrame.frameId}），将改为在该 frame 内填写。`, 'info');
      }

      let billingState = state;
      if (paymentMethod === PLUS_PAYMENT_METHOD_GOPAY && typeof probeIpProxyExit === 'function') {
        const staleExitRegion = normalizeText(
          state?.ipProxyAppliedExitRegion
          || state?.ipProxyExitRegion
          || ''
        );
        try {
          await addLog('步骤 7：GoPay 账单地址准备按代理出口填写，正在重新检测当前出口地区...', 'info');
          const probeResult = await probeIpProxyExit({
            state,
            timeoutMs: 12000,
            authRebindRetry: true,
            detectWhenDisabled: true,
          });
          const routing = probeResult?.proxyRouting || {};
          const probedExitRegion = normalizeText(routing.exitRegion || '');
          const probedExitIp = normalizeText(routing.exitIp || '');
          const probedExitSource = normalizeText(routing.exitSource || '');
          const probeEndpoint = normalizeText(routing.endpoint || routing.exitEndpoint || '');
          const probeReason = normalizeText(routing.reason || '');
          const probeError = normalizeText(routing.exitError || routing.error || '');
          if (probedExitRegion) {
            billingState = {
              ...(state || {}),
              ipProxyAppliedExitRegion: probedExitRegion,
              ipProxyExitRegion: probedExitRegion,
              ipProxyAppliedExitIp: probedExitIp,
              ipProxyAppliedExitSource: probedExitSource,
            };
            const sourceSuffix = probedExitSource ? `，来源 ${probedExitSource}` : '';
            const endpointSuffix = probeEndpoint ? `，检测地址 ${probeEndpoint}` : '';
            await addLog(`步骤 7：当前代理出口复测结果：${probedExitRegion}${probedExitIp ? ` / ${probedExitIp}` : ''}${sourceSuffix}${endpointSuffix}。`, 'info');
          } else {
            billingState = {
              ...(state || {}),
              ipProxyAppliedExitRegion: '',
              ipProxyExitRegion: '',
              ipProxyAppliedExitIp: probedExitIp,
              ipProxyAppliedExitSource: probedExitSource,
            };
            await addLog(
              `步骤 7：代理出口复测没有返回国家/地区代码，已清空旧出口地区${staleExitRegion ? ` ${staleExitRegion}` : ''}，不会继续沿用旧地区。${probeReason ? `状态：${probeReason}。` : ''}${probeError ? `诊断：${probeError}` : ''}`,
              'warn'
            );
          }
        } catch (error) {
          billingState = {
            ...(state || {}),
            ipProxyAppliedExitRegion: '',
            ipProxyExitRegion: '',
          };
          await addLog(`步骤 7：代理出口复测失败，已清空旧出口地区${staleExitRegion ? ` ${staleExitRegion}` : ''}，不会继续沿用旧地区：${error?.message || String(error || '未知错误')}`, 'warn');
        }
      }
      if (paymentMethod === PLUS_PAYMENT_METHOD_GOPAY
        && typeof probeIpProxyExit === 'function'
        && !resolveMeiguodizhiCountryCode(billingState?.ipProxyAppliedExitRegion || billingState?.ipProxyExitRegion || '')) {
        throw new Error('步骤 7：GoPay 账单地址需要当前代理出口国家/地区，但本次复测没有拿到国家码；已停止填写，避免误用旧的 KR/ID 地区。请先点 IP 代理“检测出口”，确认显示 JP 后再继续。');
      }
      const addressSeed = await resolveBillingAddressSeed(billingState, billingFrame.countryText, { paymentMethod });
      if (!addressSeed) {
        throw new Error('步骤 7：未找到可用的本地账单地址种子。');
      }

      await addLog(`步骤 7：正在填写账单地址（${addressSeed.countryCode} / ${addressSeed.query}）...`, 'info');
      const autocompleteFrame = await resolveOptionalFrameByUrl(tabId, isAutocompleteFrameUrl);
      let result = null;
      if (!addressSeed.skipAutocomplete && autocompleteFrame?.frame && autocompleteFrame.frame.frameId !== billingFrame.frameId) {
        if (!autocompleteFrame.ready) {
          throw new Error('步骤 7：发现 Google 地址推荐 iframe，但无法注入账单脚本。请提供该 iframe 的控制台结构。');
        }
        await addLog(`步骤 7：Google 地址推荐位于独立 iframe（frameId=${autocompleteFrame.frame.frameId}），将拆分输入与选择动作。`, 'info');

        const queryResult = await sendFrameMessage(tabId, billingFrame.frameId, {
          type: 'PLUS_CHECKOUT_FILL_ADDRESS_QUERY',
          source: 'background',
          payload: {
            fullName,
            addressSeed,
          },
        });
        if (queryResult?.error) {
          throw new Error(queryResult.error);
        }

        const suggestionResult = await sendFrameMessage(tabId, autocompleteFrame.frame.frameId, {
          type: 'PLUS_CHECKOUT_SELECT_ADDRESS_SUGGESTION',
          source: 'background',
          payload: {
            addressSeed,
          },
        });
        const suggestionError = suggestionResult?.error || '';
        if (suggestionError) {
          await addLog(`步骤 7：Google 地址推荐不可用，将改用本地地址字段兜底：${suggestionError}`, 'warn');
        }

        const structuredResult = await sendFrameMessage(tabId, billingFrame.frameId, {
          type: 'PLUS_CHECKOUT_ENSURE_BILLING_ADDRESS',
          source: 'background',
          payload: {
            addressSeed,
            overwriteStructuredAddress: Boolean(suggestionError),
          },
        });
        if (structuredResult?.error) {
          throw new Error(structuredResult.error);
        }

        result = {
          ...structuredResult,
          selectedAddressText: suggestionError ? '' : (suggestionResult?.selectedAddressText || ''),
        };
      } else {
        result = await sendFrameMessage(tabId, billingFrame.frameId, {
          type: 'PLUS_CHECKOUT_FILL_BILLING_ADDRESS',
          source: 'background',
          payload: {
            fullName,
            addressSeed,
          },
        });

        if (result?.error) {
          throw new Error(result.error);
        }
      }

      await setState({
        plusCheckoutTabId: tabId,
        plusBillingCountryText: result?.countryText || '',
        plusBillingAddress: result?.structuredAddress || null,
      });
      await ensureFreeTrialAmount(tabId, state, {
        phaseLabel: '提交订阅前',
      });

      let redirectedToPayment = false;
      let lastSubmitError = '';
      for (let attempt = 1; attempt <= PLUS_CHECKOUT_SUBMIT_MAX_ATTEMPTS; attempt += 1) {
        await addLog(
          attempt === 1
            ? '步骤 7：账单地址已填写完成，等待 3 秒让 checkout 完成校验...'
            : `步骤 7：准备第 ${attempt}/${PLUS_CHECKOUT_SUBMIT_MAX_ATTEMPTS} 次重新提交账单地址...`,
          attempt === 1 ? 'info' : 'warn'
        );
        await sleepWithStop(3000);
        await addLog('步骤 7：正在定位订阅按钮...', 'info');
        const subscribeFrame = await waitForSubscribeFrame(tabId, [
          { frameId: 0, url: '' },
          { frameId: paymentFrame.frameId, url: paymentFrame.frameUrl || '' },
          { frameId: billingFrame.frameId, url: billingFrame.frameUrl || '' },
        ]);
        const subscribeResult = await sendFrameMessage(tabId, subscribeFrame.frameId, {
          type: 'PLUS_CHECKOUT_CLICK_SUBSCRIBE',
          source: 'background',
          payload: {
            beforeClickDelayMs: attempt === 1 ? 700 : 1200,
            paymentMethod,
          },
        });
        if (subscribeResult?.error) {
          lastSubmitError = subscribeResult.error;
          await addLog(`步骤 7：点击订阅失败（${attempt}/${PLUS_CHECKOUT_SUBMIT_MAX_ATTEMPTS}）：${lastSubmitError}`, 'warn');
          continue;
        }

        await addLog(`步骤 7：账单地址已提交，正在等待跳转到 ${paymentConfig.label}（${attempt}/${PLUS_CHECKOUT_SUBMIT_MAX_ATTEMPTS}）...`, 'info');
        redirectedToPayment = await waitForPaymentRedirectAfterSubmit(tabId, paymentMethod);
        if (redirectedToPayment) {
          break;
        }
        lastSubmitError = `提交后 ${Math.round(PLUS_CHECKOUT_PAYPAL_REDIRECT_TIMEOUT_MS / 1000)} 秒内未跳转到 ${paymentConfig.label}`;
        await addLog(`步骤 7：${lastSubmitError}，将重试提交。`, 'warn');
      }

      if (!redirectedToPayment) {
        throw new Error(`步骤 7：多次提交账单地址后仍未跳转到 ${paymentConfig.label}。${lastSubmitError}`);
      }

      await completeStepFromBackground(7, {
        plusBillingCountryText: result?.countryText || '',
      });
    }

    return {
      executePlusCheckoutBilling,
    };
  }

  return {
    createPlusCheckoutBillingExecutor,
  };
});