diff --git a/frontend/src/router/__tests__/guards.spec.ts b/frontend/src/router/__tests__/guards.spec.ts
index bdf07b18..076b943d 100644
--- a/frontend/src/router/__tests__/guards.spec.ts
+++ b/frontend/src/router/__tests__/guards.spec.ts
@@ -78,7 +78,7 @@ function simulateGuard(
       return authState.isAdmin ? '/admin/dashboard' : '/dashboard'
     }
     if (authState.backendModeEnabled && !authState.isAuthenticated) {
-      const allowed = ['/login', '/key-usage', '/setup']
+      const allowed = ['/login', '/key-usage', '/setup', '/payment/result']
       const callbackPaths = [
         '/auth/callback',
         '/auth/linuxdo/callback',
@@ -127,7 +127,7 @@ function simulateGuard(
     if (authState.isAuthenticated && authState.isAdmin) {
       return null
     }
-    const allowed = ['/login', '/key-usage', '/setup']
+    const allowed = ['/login', '/key-usage', '/setup', '/payment/result']
     const callbackPaths = [
       '/auth/callback',
       '/auth/linuxdo/callback',
@@ -462,6 +462,18 @@ describe('路由守卫逻辑', () => {
       expect(redirect).toBeNull()
     })
 
+    it('unauthenticated: /payment/result is allowed', () => {
+      const authState: MockAuthState = {
+        isAuthenticated: false,
+        isAdmin: false,
+        isSimpleMode: false,
+        backendModeEnabled: true,
+        hasPendingAuthSession: false,
+      }
+      const redirect = simulateGuard('/payment/result', { requiresAuth: false }, authState)
+      expect(redirect).toBeNull()
+    })
+
     it('unauthenticated: /register is allowed when a pending auth session exists', () => {
       const authState: MockAuthState = {
         isAuthenticated: false,
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index b7fcf475..b97ccb5d 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -542,7 +542,7 @@ let authInitialized = false
 const navigationLoading = useNavigationLoadingState()
 // 延迟初始化预加载，传入 router 实例
 let routePrefetch: ReturnType<typeof useRoutePrefetch> | null = null
-const BACKEND_MODE_ALLOWED_PATHS = ['/login', '/key-usage', '/setup']
+const BACKEND_MODE_ALLOWED_PATHS = ['/login', '/key-usage', '/setup', '/payment/result']
 const BACKEND_MODE_CALLBACK_PATHS = [
   '/auth/callback',
   '/auth/linuxdo/callback',
diff --git a/frontend/src/views/auth/LinuxDoCallbackView.vue b/frontend/src/views/auth/LinuxDoCallbackView.vue
index 4009454c..2cf4e694 100644
--- a/frontend/src/views/auth/LinuxDoCallbackView.vue
+++ b/frontend/src/views/auth/LinuxDoCallbackView.vue
@@ -603,6 +603,14 @@ async function finalizePendingAccountResponse(completion: LinuxDoPendingActionRe
     return
   }
 
+  if (completion.auth_result === 'pending_session') {
+    needsInvitation.value = false
+    needsAdoptionConfirmation.value = false
+    isProcessing.value = false
+    persistPendingAuthSession(redirect)
+    return
+  }
+
   await finalizeCompletion(completion, redirect)
 }
 
@@ -612,9 +620,9 @@ async function handleSubmitInvitation() {
 
   isSubmitting.value = true
   try {
-    const tokenData = legacyPendingOAuthToken.value
+    const completion: LinuxDoPendingActionResponse = legacyPendingOAuthToken.value
       ? (
-          await apiClient.post<OAuthTokenResponse>('/auth/oauth/linuxdo/complete-registration', {
+          await apiClient.post<LinuxDoPendingActionResponse>('/auth/oauth/linuxdo/complete-registration', {
             pending_oauth_token: legacyPendingOAuthToken.value,
             invitation_code: invitationCode.value.trim(),
             ...serializeAdoptionDecision(currentAdoptionDecision())
@@ -624,10 +632,7 @@ async function handleSubmitInvitation() {
           invitationCode.value.trim(),
           currentAdoptionDecision()
         )
-    persistOAuthTokenContext(tokenData)
-    await authStore.setToken(tokenData.access_token)
-    appStore.showSuccess(t('auth.loginSuccess'))
-    await router.replace(redirectTo.value)
+    await finalizePendingAccountResponse(completion)
   } catch (e: unknown) {
     const err = e as { message?: string; response?: { data?: { message?: string } } }
     invitationError.value =
diff --git a/frontend/src/views/auth/OidcCallbackView.vue b/frontend/src/views/auth/OidcCallbackView.vue
index d03c70fb..873022e1 100644
--- a/frontend/src/views/auth/OidcCallbackView.vue
+++ b/frontend/src/views/auth/OidcCallbackView.vue
@@ -632,6 +632,14 @@ async function finalizePendingAccountResponse(completion: PendingOidcCompletion)
     return
   }
 
+  if (completion.auth_result === 'pending_session') {
+    needsInvitation.value = false
+    needsAdoptionConfirmation.value = false
+    isProcessing.value = false
+    persistPendingAuthSession(redirect)
+    return
+  }
+
   await finalizeCompletion(completion, redirect)
 }
 
@@ -641,9 +649,9 @@ async function handleSubmitInvitation() {
 
   isSubmitting.value = true
   try {
-    const tokenData = legacyPendingOAuthToken.value
+    const completion: PendingOidcCompletion = legacyPendingOAuthToken.value
       ? (
-          await apiClient.post<OAuthTokenResponse>('/auth/oauth/oidc/complete-registration', {
+          await apiClient.post<PendingOidcCompletion>('/auth/oauth/oidc/complete-registration', {
             pending_oauth_token: legacyPendingOAuthToken.value,
             invitation_code: invitationCode.value.trim(),
             ...serializeAdoptionDecision(currentAdoptionDecision())
@@ -653,10 +661,7 @@ async function handleSubmitInvitation() {
           invitationCode.value.trim(),
           currentAdoptionDecision()
         )
-    persistOAuthTokenContext(tokenData)
-    await authStore.setToken(tokenData.access_token)
-    appStore.showSuccess(t('auth.loginSuccess'))
-    await router.replace(redirectTo.value)
+    await finalizePendingAccountResponse(completion)
   } catch (e: unknown) {
     const err = e as { message?: string; response?: { data?: { message?: string } } }
     invitationError.value =
diff --git a/frontend/src/views/auth/WechatCallbackView.vue b/frontend/src/views/auth/WechatCallbackView.vue
index 9a71f62b..bae20df8 100644
--- a/frontend/src/views/auth/WechatCallbackView.vue
+++ b/frontend/src/views/auth/WechatCallbackView.vue
@@ -840,6 +840,14 @@ async function finalizePendingAccountResponse(completion: PendingWeChatCompletio
     return
   }
 
+  if (completion.auth_result === 'pending_session') {
+    needsInvitation.value = false
+    needsAdoptionConfirmation.value = false
+    isProcessing.value = false
+    persistPendingAuthSession(redirect)
+    return
+  }
+
   await finalizeCompletion(completion, redirect)
 }
 
@@ -849,9 +857,9 @@ async function handleSubmitInvitation() {
 
   isSubmitting.value = true
   try {
-    const tokenData = legacyPendingOAuthToken.value
+    const completion: PendingWeChatCompletion = legacyPendingOAuthToken.value
       ? (
-          await apiClient.post<OAuthTokenResponse>('/auth/oauth/wechat/complete-registration', {
+          await apiClient.post<PendingWeChatCompletion>('/auth/oauth/wechat/complete-registration', {
             pending_oauth_token: legacyPendingOAuthToken.value,
             invitation_code: invitationCode.value.trim(),
             ...serializeAdoptionDecision(currentAdoptionDecision())
@@ -861,10 +869,7 @@ async function handleSubmitInvitation() {
           invitationCode.value.trim(),
           currentAdoptionDecision()
         )
-    persistOAuthTokenContext(tokenData)
-    await authStore.setToken(tokenData.access_token)
-    appStore.showSuccess(t('auth.loginSuccess'))
-    await router.replace(redirectTo.value)
+    await finalizePendingAccountResponse(completion)
   } catch (e: unknown) {
     const err = e as { message?: string; response?: { data?: { message?: string } } }
     invitationError.value =
diff --git a/frontend/src/views/auth/WechatPaymentCallbackView.vue b/frontend/src/views/auth/WechatPaymentCallbackView.vue
index 53599ec3..225c84e1 100644
--- a/frontend/src/views/auth/WechatPaymentCallbackView.vue
+++ b/frontend/src/views/auth/WechatPaymentCallbackView.vue
@@ -85,6 +85,12 @@ function normalizeRedirectPath(path: string | null | undefined): string {
   return value
 }
 
+function appendQueryParam(query: Record<string, string>, key: string, value: string) {
+  if (value) {
+    query[key] = value
+  }
+}
+
 function goBackToPayment() {
   void router.replace('/purchase')
 }
@@ -102,12 +108,19 @@ onMounted(async () => {
   }
 
   const resumeToken = readParam('wechat_resume_token')
+  const openid = readParam('openid')
+  const state = readParam('state')
+  const scope = readParam('scope')
+  const paymentType = readParam('payment_type')
+  const amount = readParam('amount')
+  const orderType = readParam('order_type')
+  const planId = readParam('plan_id')
   const redirectURL = new URL(
     normalizeRedirectPath(readParam('redirect')),
     window.location.origin,
   )
 
-  if (!resumeToken) {
+  if (!resumeToken && !openid) {
     errorMessage.value = t('auth.wechatPayment.callbackMissingResumeToken')
     return
   }
@@ -115,7 +128,18 @@ onMounted(async () => {
   const query: Record<string, string> = {
     ...Object.fromEntries(redirectURL.searchParams.entries()),
     wechat_resume: '1',
-    wechat_resume_token: resumeToken,
+  }
+
+  if (resumeToken) {
+    query.wechat_resume_token = resumeToken
+  } else {
+    query.openid = openid
+    appendQueryParam(query, 'state', state)
+    appendQueryParam(query, 'scope', scope)
+    appendQueryParam(query, 'payment_type', paymentType)
+    appendQueryParam(query, 'amount', amount)
+    appendQueryParam(query, 'order_type', orderType)
+    appendQueryParam(query, 'plan_id', planId)
   }
 
   await router.replace({
diff --git a/frontend/src/views/auth/__tests__/LinuxDoCallbackView.spec.ts b/frontend/src/views/auth/__tests__/LinuxDoCallbackView.spec.ts
index 29aef613..3fee2c27 100644
--- a/frontend/src/views/auth/__tests__/LinuxDoCallbackView.spec.ts
+++ b/frontend/src/views/auth/__tests__/LinuxDoCallbackView.spec.ts
@@ -409,6 +409,50 @@ describe('LinuxDoCallbackView', () => {
     })
   })
 
+  it('keeps the oauth flow active when complete-registration returns another pending step', async () => {
+    exchangePendingOAuthCompletion.mockResolvedValue({
+      error: 'invitation_required',
+      redirect: '/dashboard',
+      adoption_required: true,
+      suggested_display_name: 'LinuxDo Nick',
+      suggested_avatar_url: 'https://cdn.example/linuxdo.png'
+    })
+    completeLinuxDoOAuthRegistration.mockResolvedValue({
+      auth_result: 'pending_session',
+      step: 'choose_account_action_required',
+      redirect: '/dashboard',
+      email: 'fresh@example.com',
+      resolved_email: 'fresh@example.com',
+      force_email_on_signup: true,
+      adoption_required: true
+    })
+
+    const wrapper = mount(LinuxDoCallbackView, {
+      global: {
+        stubs: {
+          AuthLayout: { template: '<div><slot /></div>' },
+          Icon: true,
+          RouterLink: { template: '<a><slot /></a>' },
+          transition: false
+        }
+      }
+    })
+
+    await flushPromises()
+    await wrapper.find('input[type="text"]').setValue('invite-code')
+    await wrapper.find('button').trigger('click')
+    await flushPromises()
+
+    expect(completeLinuxDoOAuthRegistration).toHaveBeenCalledWith('invite-code', {
+      adoptDisplayName: true,
+      adoptAvatar: true
+    })
+    expect(setToken).not.toHaveBeenCalled()
+    expect(replace).not.toHaveBeenCalled()
+    expect(wrapper.text()).toContain('auth.oauthFlow.bindExistingAccount')
+    expect(wrapper.text()).toContain('auth.oauthFlow.createNewAccount')
+  })
+
   it('collects email, password, and verify code for pending oauth account creation and submits adoption decisions', async () => {
     getPublicSettings.mockResolvedValue({
       invitation_code_enabled: true,
diff --git a/frontend/src/views/auth/__tests__/OidcCallbackView.spec.ts b/frontend/src/views/auth/__tests__/OidcCallbackView.spec.ts
index 0167604c..ec89512b 100644
--- a/frontend/src/views/auth/__tests__/OidcCallbackView.spec.ts
+++ b/frontend/src/views/auth/__tests__/OidcCallbackView.spec.ts
@@ -385,6 +385,50 @@ describe('OidcCallbackView', () => {
     })
   })
 
+  it('keeps the oauth flow active when complete-registration returns another pending step', async () => {
+    exchangePendingOAuthCompletion.mockResolvedValue({
+      error: 'invitation_required',
+      redirect: '/dashboard',
+      adoption_required: true,
+      suggested_display_name: 'OIDC Nick',
+      suggested_avatar_url: 'https://cdn.example/oidc.png'
+    })
+    completeOIDCOAuthRegistration.mockResolvedValue({
+      auth_result: 'pending_session',
+      step: 'choose_account_action_required',
+      redirect: '/dashboard',
+      email: 'fresh@example.com',
+      resolved_email: 'fresh@example.com',
+      force_email_on_signup: true,
+      adoption_required: true
+    })
+
+    const wrapper = mount(OidcCallbackView, {
+      global: {
+        stubs: {
+          AuthLayout: { template: '<div><slot /></div>' },
+          Icon: true,
+          RouterLink: { template: '<a><slot /></a>' },
+          transition: false
+        }
+      }
+    })
+
+    await flushPromises()
+    await wrapper.find('input[type="text"]').setValue('invite-code')
+    await wrapper.find('button').trigger('click')
+    await flushPromises()
+
+    expect(completeOIDCOAuthRegistration).toHaveBeenCalledWith('invite-code', {
+      adoptDisplayName: true,
+      adoptAvatar: true
+    })
+    expect(setToken).not.toHaveBeenCalled()
+    expect(replace).not.toHaveBeenCalled()
+    expect(wrapper.text()).toContain('auth.oauthFlow.bindExistingAccount')
+    expect(wrapper.text()).toContain('auth.oauthFlow.createNewAccount')
+  })
+
   it('collects email, password, and verify code for pending oauth account creation and submits adoption decisions', async () => {
     getPublicSettings.mockResolvedValue({
       oidc_oauth_provider_name: 'ExampleID',
diff --git a/frontend/src/views/auth/__tests__/WechatCallbackView.spec.ts b/frontend/src/views/auth/__tests__/WechatCallbackView.spec.ts
index cc72107d..da41c987 100644
--- a/frontend/src/views/auth/__tests__/WechatCallbackView.spec.ts
+++ b/frontend/src/views/auth/__tests__/WechatCallbackView.spec.ts
@@ -517,6 +517,50 @@ describe('WechatCallbackView', () => {
     expect(replaceMock).toHaveBeenCalledWith('/subscriptions')
   })
 
+  it('keeps the oauth flow active when complete-registration returns another pending step', async () => {
+    exchangePendingOAuthCompletionMock.mockResolvedValue({
+      error: 'invitation_required',
+      redirect: '/dashboard',
+      adoption_required: true,
+      suggested_display_name: 'WeChat Nick',
+      suggested_avatar_url: 'https://cdn.example/wechat.png',
+    })
+    completeWeChatOAuthRegistrationMock.mockResolvedValue({
+      auth_result: 'pending_session',
+      step: 'choose_account_action_required',
+      redirect: '/dashboard',
+      email: 'fresh@example.com',
+      resolved_email: 'fresh@example.com',
+      force_email_on_signup: true,
+      adoption_required: true,
+    })
+
+    const wrapper = mount(WechatCallbackView, {
+      global: {
+        stubs: {
+          AuthLayout: { template: '<div><slot /></div>' },
+          Icon: true,
+          RouterLink: { template: '<a><slot /></a>' },
+          transition: false,
+        },
+      },
+    })
+
+    await flushPromises()
+    await wrapper.find('input[type="text"]').setValue('invite-code')
+    await wrapper.find('button').trigger('click')
+    await flushPromises()
+
+    expect(completeWeChatOAuthRegistrationMock).toHaveBeenCalledWith('invite-code', {
+      adoptDisplayName: true,
+      adoptAvatar: true,
+    })
+    expect(setTokenMock).not.toHaveBeenCalled()
+    expect(replaceMock).not.toHaveBeenCalled()
+    expect(wrapper.get('[data-testid="wechat-choice-bind-existing"]').exists()).toBe(true)
+    expect(wrapper.get('[data-testid="wechat-choice-create-account"]').exists()).toBe(true)
+  })
+
   it('offers existing-account email collection during invitation flow', async () => {
     exchangePendingOAuthCompletionMock.mockResolvedValue({
       error: 'invitation_required',
diff --git a/frontend/src/views/auth/__tests__/WechatPaymentCallbackView.spec.ts b/frontend/src/views/auth/__tests__/WechatPaymentCallbackView.spec.ts
index 93cd0e94..822a083b 100644
--- a/frontend/src/views/auth/__tests__/WechatPaymentCallbackView.spec.ts
+++ b/frontend/src/views/auth/__tests__/WechatPaymentCallbackView.spec.ts
@@ -79,6 +79,29 @@ describe('WechatPaymentCallbackView', () => {
     })
   })
 
+  it('redirects legacy openid callback payloads back to purchase while preserving resume context', async () => {
+    locationState.current.hash =
+      '#openid=openid-123&state=oauth-state&scope=snsapi_base&payment_type=wxpay_direct&amount=128&order_type=subscription&plan_id=7&redirect=%2Fpayment%3Ffrom%3Dwechat'
+
+    mount(WechatPaymentCallbackView)
+    await flushPromises()
+
+    expect(replaceMock).toHaveBeenCalledWith({
+      path: '/purchase',
+      query: {
+        from: 'wechat',
+        wechat_resume: '1',
+        openid: 'openid-123',
+        state: 'oauth-state',
+        scope: 'snsapi_base',
+        payment_type: 'wxpay_direct',
+        amount: '128',
+        order_type: 'subscription',
+        plan_id: '7',
+      },
+    })
+  })
+
   it('shows an error when the callback payload is missing the resume token', async () => {
     locationState.current.hash = '#payment_type=wxpay'