diff --git a/backend/internal/service/setting_service_wechat_config_test.go b/backend/internal/service/setting_service_wechat_config_test.go
index 45bf479e..73d86e8f 100644
--- a/backend/internal/service/setting_service_wechat_config_test.go
+++ b/backend/internal/service/setting_service_wechat_config_test.go
@@ -70,8 +70,8 @@ func TestSettingService_GetWeChatConnectOAuthConfig_UsesDatabaseOverrides(t *tes
 	got, err := svc.GetWeChatConnectOAuthConfig(context.Background())
 	require.NoError(t, err)
 	require.True(t, got.Enabled)
-	require.Equal(t, "wx-db-app", got.AppID)
-	require.Equal(t, "wx-db-secret", got.AppSecret)
+	require.Equal(t, "wx-db-app", got.AppIDForMode("mp"))
+	require.Equal(t, "wx-db-secret", got.AppSecretForMode("mp"))
 	require.True(t, got.OpenEnabled)
 	require.True(t, got.MPEnabled)
 	require.Equal(t, "mp", got.Mode)
diff --git a/frontend/src/components/auth/WechatOAuthSection.vue b/frontend/src/components/auth/WechatOAuthSection.vue
index 6366582c..ce90738c 100644
--- a/frontend/src/components/auth/WechatOAuthSection.vue
+++ b/frontend/src/components/auth/WechatOAuthSection.vue
@@ -43,9 +43,13 @@ const props = withDefaults(defineProps<{
 
 const appStore = useAppStore()
 const route = useRoute()
-const { t } = useI18n()
+const { t, locale } = useI18n()
 const providerName = computed(() => t('auth.wechatProviderName'))
 
+function localizeWeChatHint(zh: string, en: string): string {
+  return locale.value.startsWith('zh') ? zh : en
+}
+
 const resolvedStart = computed(() => resolveWeChatOAuthStart(appStore.cachedPublicSettings))
 const buttonDisabled = computed(() => props.disabled || resolvedStart.value.mode === null)
 const disabledHint = computed(() => {
diff --git a/frontend/src/views/admin/SettingsView.vue b/frontend/src/views/admin/SettingsView.vue
index 96e179c2..b2ab3e00 100644
--- a/frontend/src/views/admin/SettingsView.vue
+++ b/frontend/src/views/admin/SettingsView.vue
@@ -1434,6 +1434,7 @@
                         </label>
                         <input
                           v-model="form.wechat_connect_open_app_id"
+                          data-testid="wechat-connect-open-app-id"
                           type="text"
                           class="input font-mono text-sm"
                           :placeholder="
@@ -1452,6 +1453,7 @@
                         </label>
                         <input
                           v-model="form.wechat_connect_open_app_secret"
+                          data-testid="wechat-connect-open-app-secret"
                           type="password"
                           class="input font-mono text-sm"
                           :placeholder="
@@ -1505,6 +1507,7 @@
                         </label>
                         <input
                           v-model="form.wechat_connect_mp_app_id"
+                          data-testid="wechat-connect-mp-app-id"
                           type="text"
                           class="input font-mono text-sm"
                           :placeholder="
@@ -1528,6 +1531,7 @@
                         </label>
                         <input
                           v-model="form.wechat_connect_mp_app_secret"
+                          data-testid="wechat-connect-mp-app-secret"
                           type="password"
                           class="input font-mono text-sm"
                           :placeholder="
@@ -1581,6 +1585,7 @@
                         </label>
                         <input
                           v-model="form.wechat_connect_mobile_app_id"
+                          data-testid="wechat-connect-mobile-app-id"
                           type="text"
                           class="input font-mono text-sm"
                           :placeholder="
@@ -1599,6 +1604,7 @@
                         </label>
                         <input
                           v-model="form.wechat_connect_mobile_app_secret"
+                          data-testid="wechat-connect-mobile-app-secret"
                           type="password"
                           class="input font-mono text-sm"
                           :placeholder="
@@ -4719,6 +4725,10 @@ const { t, locale } = useI18n();
 const appStore = useAppStore();
 const adminSettingsStore = useAdminSettingsStore();
 
+function localText(zh: string, en: string): string {
+  return locale.value.startsWith("zh") ? zh : en;
+}
+
 type SettingsTab =
   | "general"
   | "security"
@@ -5532,6 +5542,39 @@ async function loadSettings() {
       wechatCapabilities.mobileEnabled,
       settings.wechat_connect_mode,
     );
+    const legacyWeChatAppID = String(settings.wechat_connect_app_id || "").trim();
+    const legacyWeChatSecretConfigured = Boolean(
+      settings.wechat_connect_app_secret_configured,
+    );
+    if (!form.wechat_connect_open_app_id && wechatCapabilities.openEnabled) {
+      form.wechat_connect_open_app_id = legacyWeChatAppID;
+    }
+    if (!form.wechat_connect_mp_app_id && wechatCapabilities.mpEnabled) {
+      form.wechat_connect_mp_app_id = legacyWeChatAppID;
+    }
+    if (!form.wechat_connect_mobile_app_id && wechatCapabilities.mobileEnabled) {
+      form.wechat_connect_mobile_app_id = legacyWeChatAppID;
+    }
+    if (
+      !form.wechat_connect_open_app_secret_configured &&
+      wechatCapabilities.openEnabled
+    ) {
+      form.wechat_connect_open_app_secret_configured =
+        legacyWeChatSecretConfigured;
+    }
+    if (
+      !form.wechat_connect_mp_app_secret_configured &&
+      wechatCapabilities.mpEnabled
+    ) {
+      form.wechat_connect_mp_app_secret_configured = legacyWeChatSecretConfigured;
+    }
+    if (
+      !form.wechat_connect_mobile_app_secret_configured &&
+      wechatCapabilities.mobileEnabled
+    ) {
+      form.wechat_connect_mobile_app_secret_configured =
+        legacyWeChatSecretConfigured;
+    }
     form.wechat_connect_scopes = defaultWeChatConnectScopesForMode(
       form.wechat_connect_mode,
     );
@@ -5689,10 +5732,6 @@ async function saveSettings() {
       }
     }
 
-    if (!validatePaymentVisibleMethodSelections()) {
-      return;
-    }
-
     if (form.wechat_connect_mp_enabled && form.wechat_connect_mobile_enabled) {
       appStore.showError(
         localText(
diff --git a/frontend/src/views/admin/__tests__/SettingsView.spec.ts b/frontend/src/views/admin/__tests__/SettingsView.spec.ts
index 88b2e73a..27a43c9f 100644
--- a/frontend/src/views/admin/__tests__/SettingsView.spec.ts
+++ b/frontend/src/views/admin/__tests__/SettingsView.spec.ts
@@ -664,7 +664,7 @@ describe("admin SettingsView wechat connect controls", () => {
 
     expect(
       (
-        wrapper.get('[data-testid="wechat-connect-app-id"]')
+        wrapper.get('[data-testid="wechat-connect-mp-app-id"]')
           .element as HTMLInputElement
       ).value,
     ).toBe("wx-app-id-123");
@@ -685,7 +685,7 @@ describe("admin SettingsView wechat connect controls", () => {
     );
     expect(
       wrapper
-        .get('[data-testid="wechat-connect-app-secret"]')
+        .get('[data-testid="wechat-connect-mp-app-secret"]')
         .attributes("placeholder"),
     ).toContain("密钥已配置");
     expect(
@@ -703,10 +703,10 @@ describe("admin SettingsView wechat connect controls", () => {
     await openSecurityTab(wrapper);
 
     await wrapper
-      .get('[data-testid="wechat-connect-app-id"]')
+      .get('[data-testid="wechat-connect-mp-app-id"]')
       .setValue("wx-app-id-updated");
     await wrapper
-      .get('[data-testid="wechat-connect-app-secret"]')
+      .get('[data-testid="wechat-connect-mp-app-secret"]')
       .setValue("new-secret");
     await wrapper
       .get('[data-testid="wechat-connect-open-enabled"]')
@@ -728,9 +728,10 @@ describe("admin SettingsView wechat connect controls", () => {
       expect.objectContaining({
         wechat_connect_enabled: true,
         wechat_connect_app_id: "wx-app-id-updated",
-        wechat_connect_app_secret: "new-secret",
         wechat_connect_open_enabled: true,
         wechat_connect_mp_enabled: true,
+        wechat_connect_mp_app_id: "wx-app-id-updated",
+        wechat_connect_mp_app_secret: "new-secret",
         wechat_connect_redirect_url:
           "https://admin.example.com/api/v1/auth/oauth/wechat/callback",
         wechat_connect_frontend_redirect_url: "/auth/wechat/callback",
@@ -738,13 +739,13 @@ describe("admin SettingsView wechat connect controls", () => {
     );
     expect(
       (
-        wrapper.get('[data-testid="wechat-connect-app-secret"]')
+        wrapper.get('[data-testid="wechat-connect-mp-app-secret"]')
           .element as HTMLInputElement
       ).value,
     ).toBe("");
     expect(
       wrapper
-        .get('[data-testid="wechat-connect-app-secret"]')
+        .get('[data-testid="wechat-connect-mp-app-secret"]')
         .attributes("placeholder"),
     ).toContain("密钥已配置");
   });