fix(ci): align auth and payment verification tests

backend/internal/config/config_test.go

@@ -389,6 +389,7 @@ func TestValidateOIDCScopesMustContainOpenID(t *testing.T) {
 	cfg.OIDC.RedirectURL = "https://example.com/api/v1/auth/oauth/oidc/callback"
 	cfg.OIDC.FrontendRedirectURL = "/auth/oidc/callback"
 	cfg.OIDC.Scopes = "profile email"
+	cfg.OIDC.UsePKCE = true
 
 	err = cfg.Validate()
 	if err == nil {
@@ -418,6 +419,7 @@ func TestValidateOIDCAllowsIssuerOnlyEndpointsWithDiscoveryFallback(t *testing.T
 	cfg.OIDC.FrontendRedirectURL = "/auth/oidc/callback"
 	cfg.OIDC.Scopes = "openid email profile"
 	cfg.OIDC.ValidateIDToken = true
+	cfg.OIDC.UsePKCE = true
 
 	err = cfg.Validate()
 	if err != nil {
@@ -840,6 +842,7 @@ func TestValidateConfigWithLinuxDoEnabled(t *testing.T) {
 	cfg.LinuxDo.RedirectURL = "https://example.com/api/v1/auth/oauth/linuxdo/callback"
 	cfg.LinuxDo.FrontendRedirectURL = "/auth/linuxdo/callback"
 	cfg.LinuxDo.TokenAuthMethod = "client_secret_post"
+	cfg.LinuxDo.UsePKCE = true
 
 	if err := cfg.Validate(); err != nil {
 		t.Fatalf("Validate() unexpected error: %v", err)
@@ -990,6 +993,7 @@ func TestValidateConfigErrors(t *testing.T) {
 			name: "linuxdo client id required",
 			mutate: func(c *Config) {
 				c.LinuxDo.Enabled = true
+				c.LinuxDo.UsePKCE = true
 				c.LinuxDo.ClientID = ""
 			},
 			wantErr: "linuxdo_connect.client_id",
@@ -998,6 +1002,7 @@ func TestValidateConfigErrors(t *testing.T) {
 			name: "linuxdo token auth method",
 			mutate: func(c *Config) {
 				c.LinuxDo.Enabled = true
+				c.LinuxDo.UsePKCE = true
 				c.LinuxDo.ClientID = "client"
 				c.LinuxDo.ClientSecret = "secret"
 				c.LinuxDo.AuthorizeURL = "https://example.com/authorize"

backend/internal/handler/auth_linuxdo_oauth_test.go

@@ -184,7 +184,7 @@ func TestLinuxDoOAuthBindStartAcceptsAccessTokenCookie(t *testing.T) {
 		TokenAuthMethod:     "client_secret_post",
 		UsePKCE:             true,
 	})
-	defer client.Close()
+	t.Cleanup(func() { _ = client.Close() })
 
 	user, err := client.User.Create().
 		SetEmail("bind-cookie@example.com").
@@ -226,7 +226,7 @@ func TestLinuxDoOAuthBindStartAcceptsAccessTokenCookie(t *testing.T) {
 	require.Equal(t, -1, accessTokenCookie.MaxAge)
 }
 
-func TestLinuxDoOAuthCallbackCreatesLoginPendingSessionForExistingUser(t *testing.T) {
+func TestLinuxDoOAuthCallbackCreatesLoginPendingSessionForExistingIdentityUser(t *testing.T) {
 	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		switch r.URL.Path {
 		case "/token":
@@ -254,7 +254,7 @@ func TestLinuxDoOAuthCallbackCreatesLoginPendingSessionForExistingUser(t *testin
 		TokenAuthMethod:     "client_secret_post",
 		UsePKCE:             true,
 	})
-	defer client.Close()
+	t.Cleanup(func() { _ = client.Close() })
 
 	ctx := context.Background()
 	existingUser, err := client.User.Create().
@@ -265,6 +265,14 @@ func TestLinuxDoOAuthCallbackCreatesLoginPendingSessionForExistingUser(t *testin
 		SetStatus(service.StatusActive).
 		Save(ctx)
 	require.NoError(t, err)
+	_, err = client.AuthIdentity.Create().
+		SetUserID(existingUser.ID).
+		SetProviderType("linuxdo").
+		SetProviderKey("linuxdo").
+		SetProviderSubject("321").
+		SetMetadata(map[string]any{"username": "legacy-user"}).
+		Save(ctx)
+	require.NoError(t, err)
 
 	recorder := httptest.NewRecorder()
 	c, _ := gin.CreateTestContext(recorder)
@@ -294,7 +302,8 @@ func TestLinuxDoOAuthCallbackCreatesLoginPendingSessionForExistingUser(t *testin
 	require.Equal(t, linuxDoSyntheticEmail("321"), session.ResolvedEmail)
 	require.Equal(t, "LinuxDo Display", session.UpstreamIdentityClaims["suggested_display_name"])
 
-	completion := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	completion, ok := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	require.True(t, ok)
 	require.Equal(t, "/dashboard", completion["redirect"])
 	require.NotEmpty(t, completion["access_token"])
 	require.Nil(t, completion["error"])
@@ -328,7 +337,7 @@ func TestLinuxDoOAuthCallbackCreatesBindPendingSessionForCompatEmailUser(t *test
 		TokenAuthMethod:     "client_secret_post",
 		UsePKCE:             true,
 	})
-	defer client.Close()
+	t.Cleanup(func() { _ = client.Close() })
 
 	ctx := context.Background()
 	existingUser, err := client.User.Create().
@@ -362,21 +371,24 @@ func TestLinuxDoOAuthCallbackCreatesBindPendingSessionForCompatEmailUser(t *test
 		Where(pendingauthsession.SessionTokenEQ(decodeCookieValueForTest(t, sessionCookie.Value))).
 		Only(ctx)
 	require.NoError(t, err)
-	require.Equal(t, "adopt_existing_user_by_email", session.Intent)
-	require.NotNil(t, session.TargetUserID)
-	require.Equal(t, existingUser.ID, *session.TargetUserID)
+	require.Equal(t, oauthIntentLogin, session.Intent)
+	require.Nil(t, session.TargetUserID)
 	require.Equal(t, existingUser.Email, session.ResolvedEmail)
 	require.Equal(t, "legacy@example.com", session.UpstreamIdentityClaims["compat_email"])
 
-	completion := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	completion, ok := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	require.True(t, ok)
 	require.Equal(t, "/dashboard", completion["redirect"])
-	require.Equal(t, "bind_login_required", completion["step"])
+	require.Equal(t, oauthPendingChoiceStep, completion["step"])
 	require.Equal(t, existingUser.Email, completion["email"])
+	require.Equal(t, existingUser.Email, completion["existing_account_email"])
+	require.Equal(t, true, completion["existing_account_bindable"])
+	require.Equal(t, "compat_email_match", completion["choice_reason"])
 	_, hasAccessToken := completion["access_token"]
 	require.False(t, hasAccessToken)
 }
 
-func TestLinuxDoOAuthCallbackCreatesInvitationPendingSessionWhenSignupRequiresInvite(t *testing.T) {
+func TestLinuxDoOAuthCallbackCreatesChoicePendingSessionWhenSignupRequiresInvite(t *testing.T) {
 	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		switch r.URL.Path {
 		case "/token":
@@ -404,7 +416,7 @@ func TestLinuxDoOAuthCallbackCreatesInvitationPendingSessionWhenSignupRequiresIn
 		TokenAuthMethod:     "client_secret_post",
 		UsePKCE:             true,
 	})
-	defer client.Close()
+	t.Cleanup(func() { _ = client.Close() })
 
 	recorder := httptest.NewRecorder()
 	c, _ := gin.CreateTestContext(recorder)
@@ -432,9 +444,11 @@ func TestLinuxDoOAuthCallbackCreatesInvitationPendingSessionWhenSignupRequiresIn
 	require.Equal(t, oauthIntentLogin, session.Intent)
 	require.Nil(t, session.TargetUserID)
 
-	completion := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
-	require.Equal(t, "invitation_required", completion["error"])
+	completion, ok := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, oauthPendingChoiceStep, completion["step"])
 	require.Equal(t, "/dashboard", completion["redirect"])
+	require.Equal(t, "third_party_signup", completion["choice_reason"])
 }
 
 func TestLinuxDoOAuthCallbackCreatesBindPendingSessionForCurrentUser(t *testing.T) {
@@ -465,7 +479,7 @@ func TestLinuxDoOAuthCallbackCreatesBindPendingSessionForCurrentUser(t *testing.
 		TokenAuthMethod:     "client_secret_post",
 		UsePKCE:             true,
 	})
-	defer client.Close()
+	t.Cleanup(func() { _ = client.Close() })
 
 	ctx := context.Background()
 	currentUser, err := client.User.Create().
@@ -505,7 +519,8 @@ func TestLinuxDoOAuthCallbackCreatesBindPendingSessionForCurrentUser(t *testing.
 	require.Equal(t, currentUser.ID, *session.TargetUserID)
 	require.Equal(t, linuxDoSyntheticEmail("999"), session.ResolvedEmail)
 
-	completion := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	completion, ok := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	require.True(t, ok)
 	require.Equal(t, "/settings/connections", completion["redirect"])
 	require.Empty(t, completion["access_token"])
 	require.Equal(t, "Bind Display", session.UpstreamIdentityClaims["suggested_display_name"])

backend/internal/handler/auth_oauth_pending_flow.go

@@ -298,19 +298,6 @@ func (r oauthAdoptionDecisionRequest) hasDecision() bool {
 	return r.AdoptDisplayName != nil || r.AdoptAvatar != nil
 }
 
-func (r oauthAdoptionDecisionRequest) toServiceInput(sessionID int64) service.PendingIdentityAdoptionDecisionInput {
-	input := service.PendingIdentityAdoptionDecisionInput{
-		PendingAuthSessionID: sessionID,
-	}
-	if r.AdoptDisplayName != nil {
-		input.AdoptDisplayName = *r.AdoptDisplayName
-	}
-	if r.AdoptAvatar != nil {
-		input.AdoptAvatar = *r.AdoptAvatar
-	}
-	return input
-}
-
 func bindOptionalOAuthAdoptionDecision(c *gin.Context) (oauthAdoptionDecisionRequest, error) {
 	var req oauthAdoptionDecisionRequest
 	if c == nil || c.Request == nil || c.Request.Body == nil {
@@ -325,24 +312,6 @@ func bindOptionalOAuthAdoptionDecision(c *gin.Context) (oauthAdoptionDecisionReq
 	return req, nil
 }
 
-func persistPendingOAuthAdoptionDecision(
-	c *gin.Context,
-	svc *service.AuthPendingIdentityService,
-	sessionID int64,
-	req oauthAdoptionDecisionRequest,
-) error {
-	if !req.hasDecision() {
-		return nil
-	}
-	if svc == nil {
-		return infraerrors.ServiceUnavailable("PENDING_AUTH_NOT_READY", "pending auth service is not ready")
-	}
-	if _, err := svc.UpsertAdoptionDecision(c.Request.Context(), req.toServiceInput(sessionID)); err != nil {
-		return infraerrors.InternalServer("PENDING_AUTH_ADOPTION_SAVE_FAILED", "failed to save oauth profile adoption decision").WithCause(err)
-	}
-	return nil
-}
-
 func cloneOAuthMetadata(values map[string]any) map[string]any {
 	if len(values) == 0 {
 		return map[string]any{}
@@ -418,30 +387,6 @@ func (h *AuthHandler) findOAuthIdentityUser(ctx context.Context, identity servic
 	return userEntity, nil
 }
 
-func (h *AuthHandler) createOAuthEmailRequiredPendingSession(
-	c *gin.Context,
-	identity service.PendingAuthIdentityKey,
-	redirectTo string,
-	browserSessionKey string,
-	upstreamClaims map[string]any,
-) error {
-	return h.createOAuthPendingSession(c, oauthPendingSessionPayload{
-		Intent:                 oauthIntentLogin,
-		Identity:               identity,
-		RedirectTo:             redirectTo,
-		BrowserSessionKey:      browserSessionKey,
-		UpstreamIdentityClaims: upstreamClaims,
-		CompletionResponse: map[string]any{
-			"redirect":                  strings.TrimSpace(redirectTo),
-			"step":                      oauthPendingChoiceStep,
-			"adoption_required":         true,
-			"force_email_on_signup":     true,
-			"email_binding_required":    true,
-			"existing_account_bindable": true,
-		},
-	})
-}
-
 func (h *AuthHandler) BindLinuxDoOAuthLogin(c *gin.Context) { h.bindPendingOAuthLogin(c, "linuxdo") }
 func (h *AuthHandler) BindOIDCOAuthLogin(c *gin.Context)    { h.bindPendingOAuthLogin(c, "oidc") }
 func (h *AuthHandler) BindWeChatOAuthLogin(c *gin.Context)  { h.bindPendingOAuthLogin(c, "wechat") }

backend/internal/handler/auth_oauth_pending_flow_test.go

@@ -965,11 +965,11 @@ func TestCreateOIDCOAuthAccountCreatesUserBindsIdentityAndConsumesSession(t *tes
 	require.NotNil(t, storedSession.ConsumedAt)
 }
 
-func TestCreateOIDCOAuthAccountExistingEmailReturnsAdoptExistingUserByEmailState(t *testing.T) {
+func TestCreateOIDCOAuthAccountExistingEmailReturnsChoicePendingSessionState(t *testing.T) {
 	handler, client := newOAuthPendingFlowTestHandlerWithEmailVerification(t, false, "owner@example.com", "135790")
 	ctx := context.Background()
 
-	existingUser, err := client.User.Create().
+	_, err := client.User.Create().
 		SetEmail("owner@example.com").
 		SetUsername("owner-user").
 		SetPasswordHash("hash").
@@ -1011,18 +1011,19 @@ func TestCreateOIDCOAuthAccountExistingEmailReturnsAdoptExistingUserByEmailState
 	var payload map[string]any
 	require.NoError(t, json.Unmarshal(recorder.Body.Bytes(), &payload))
 	require.Equal(t, "pending_session", payload["auth_result"])
-	require.Equal(t, "adopt_existing_user_by_email", payload["intent"])
+	require.Equal(t, oauthIntentLogin, payload["intent"])
 	require.Equal(t, "oidc", payload["provider"])
 	require.Equal(t, "/dashboard", payload["redirect"])
 	require.Equal(t, true, payload["adoption_required"])
+	require.Equal(t, oauthPendingChoiceStep, payload["step"])
+	require.Equal(t, "owner@example.com", payload["email"])
 	require.Equal(t, "Existing OIDC User", payload["suggested_display_name"])
 	require.Equal(t, "https://cdn.example/existing.png", payload["suggested_avatar_url"])
 
 	storedSession, err := client.PendingAuthSession.Get(ctx, session.ID)
 	require.NoError(t, err)
-	require.Equal(t, "adopt_existing_user_by_email", storedSession.Intent)
-	require.NotNil(t, storedSession.TargetUserID)
-	require.Equal(t, existingUser.ID, *storedSession.TargetUserID)
+	require.Equal(t, oauthIntentLogin, storedSession.Intent)
+	require.Nil(t, storedSession.TargetUserID)
 	require.Equal(t, "owner@example.com", storedSession.ResolvedEmail)
 	require.Nil(t, storedSession.ConsumedAt)
 
@@ -1041,7 +1042,7 @@ func TestCreateOIDCOAuthAccountExistingEmailNormalizesLegacySpacingAndCase(t *te
 	handler, client := newOAuthPendingFlowTestHandlerWithEmailVerification(t, false, "owner@example.com", "135790")
 	ctx := context.Background()
 
-	existingUser, err := client.User.Create().
+	_, err := client.User.Create().
 		SetEmail(" Owner@Example.com ").
 		SetUsername("owner-user").
 		SetPasswordHash("hash").
@@ -1082,12 +1083,12 @@ func TestCreateOIDCOAuthAccountExistingEmailNormalizesLegacySpacingAndCase(t *te
 
 	var payload map[string]any
 	require.NoError(t, json.Unmarshal(recorder.Body.Bytes(), &payload))
-	require.Equal(t, "adopt_existing_user_by_email", payload["intent"])
+	require.Equal(t, oauthIntentLogin, payload["intent"])
+	require.Equal(t, oauthPendingChoiceStep, payload["step"])
 
 	storedSession, err := client.PendingAuthSession.Get(ctx, session.ID)
 	require.NoError(t, err)
-	require.NotNil(t, storedSession.TargetUserID)
-	require.Equal(t, existingUser.ID, *storedSession.TargetUserID)
+	require.Nil(t, storedSession.TargetUserID)
 	require.Equal(t, "owner@example.com", storedSession.ResolvedEmail)
 }
 
@@ -1095,7 +1096,7 @@ func TestSendPendingOAuthVerifyCodeExistingEmailReturnsBindLoginState(t *testing
 	handler, client := newOAuthPendingFlowTestHandlerWithEmailVerification(t, false, "owner@example.com", "135790")
 	ctx := context.Background()
 
-	existingUser, err := client.User.Create().
+	_, err := client.User.Create().
 		SetEmail("owner@example.com").
 		SetUsername("owner-user").
 		SetPasswordHash("hash").
@@ -1137,14 +1138,13 @@ func TestSendPendingOAuthVerifyCodeExistingEmailReturnsBindLoginState(t *testing
 	var payload map[string]any
 	require.NoError(t, json.Unmarshal(recorder.Body.Bytes(), &payload))
 	require.Equal(t, "pending_session", payload["auth_result"])
-	require.Equal(t, "bind_login_required", payload["step"])
+	require.Equal(t, oauthPendingChoiceStep, payload["step"])
 	require.Equal(t, "owner@example.com", payload["email"])
 
 	storedSession, err := client.PendingAuthSession.Get(ctx, session.ID)
 	require.NoError(t, err)
-	require.Equal(t, "adopt_existing_user_by_email", storedSession.Intent)
-	require.NotNil(t, storedSession.TargetUserID)
-	require.Equal(t, existingUser.ID, *storedSession.TargetUserID)
+	require.Equal(t, oauthIntentLogin, storedSession.Intent)
+	require.Nil(t, storedSession.TargetUserID)
 	require.Equal(t, "owner@example.com", storedSession.ResolvedEmail)
 }
 
@@ -1260,7 +1260,7 @@ func TestCreateOIDCOAuthAccountRollsBackCreatedUserWhenBindingFails(t *testing.T
 
 	handler.CreateOIDCOAuthAccount(ginCtx)
 
-	require.Equal(t, http.StatusInternalServerError, recorder.Code)
+	require.Equal(t, http.StatusConflict, recorder.Code)
 
 	userCount, err := client.User.Query().Where(dbuser.EmailEQ("fresh@example.com")).Count(ctx)
 	require.NoError(t, err)
@@ -2429,7 +2429,7 @@ func loadUserAvatarRecord(t *testing.T, client *dbent.Client, userID int64) *oau
 		&rows,
 	)
 	require.NoError(t, err)
-	defer rows.Close()
+	defer func() { _ = rows.Close() }()
 
 	if !rows.Next() {
 		require.NoError(t, rows.Err())
@@ -2459,7 +2459,7 @@ func countProviderGrantRecords(
 		&rows,
 	)
 	require.NoError(t, err)
-	defer rows.Close()
+	defer func() { _ = rows.Close() }()
 
 	require.True(t, rows.Next())
 	var count int
@@ -2587,7 +2587,7 @@ func (r *oauthPendingFlowUserRepo) GetUserAvatar(ctx context.Context, userID int
 	); err != nil {
 		return nil, err
 	}
-	defer rows.Close()
+	defer func() { _ = rows.Close() }()
 
 	if !rows.Next() {
 		return nil, rows.Err()

backend/internal/handler/auth_oidc_oauth_test.go

@@ -186,7 +186,7 @@ func TestOIDCOAuthBindStartRedirectsAndSetsBindCookies(t *testing.T) {
 	require.Equal(t, int64(84), userID)
 }
 
-func TestOIDCOAuthCallbackCreatesLoginPendingSessionForExistingUser(t *testing.T) {
+func TestOIDCOAuthCallbackCreatesLoginPendingSessionForExistingIdentityUser(t *testing.T) {
 	cfg, cleanup := newOIDCTestProvider(t, oidcProviderFixture{
 		Subject:           "oidc-subject-login",
 		PreferredUsername: "oidc_login",
@@ -198,7 +198,7 @@ func TestOIDCOAuthCallbackCreatesLoginPendingSessionForExistingUser(t *testing.T
 	defer cleanup()
 
 	handler, client := newOIDCOAuthHandlerAndClient(t, false, cfg)
-	defer client.Close()
+	t.Cleanup(func() { _ = client.Close() })
 
 	ctx := context.Background()
 	existingUser, err := client.User.Create().
@@ -209,6 +209,14 @@ func TestOIDCOAuthCallbackCreatesLoginPendingSessionForExistingUser(t *testing.T
 		SetStatus(service.StatusActive).
 		Save(ctx)
 	require.NoError(t, err)
+	_, err = client.AuthIdentity.Create().
+		SetUserID(existingUser.ID).
+		SetProviderType("oidc").
+		SetProviderKey(cfg.IssuerURL).
+		SetProviderSubject("oidc-subject-login").
+		SetMetadata(map[string]any{"username": "legacy-user"}).
+		Save(ctx)
+	require.NoError(t, err)
 
 	recorder := httptest.NewRecorder()
 	c, _ := gin.CreateTestContext(recorder)
@@ -239,7 +247,8 @@ func TestOIDCOAuthCallbackCreatesLoginPendingSessionForExistingUser(t *testing.T
 	require.Equal(t, cfg.IssuerURL, session.ProviderKey)
 	require.Equal(t, "OIDC Login Display", session.UpstreamIdentityClaims["suggested_display_name"])
 
-	completion := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	completion, ok := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	require.True(t, ok)
 	require.Equal(t, "/dashboard", completion["redirect"])
 	require.NotEmpty(t, completion["access_token"])
 	require.Nil(t, completion["error"])
@@ -257,7 +266,7 @@ func TestOIDCOAuthCallbackCreatesBindPendingSessionForCompatEmailUser(t *testing
 	defer cleanup()
 
 	handler, client := newOIDCOAuthHandlerAndClient(t, false, cfg)
-	defer client.Close()
+	t.Cleanup(func() { _ = client.Close() })
 
 	ctx := context.Background()
 	existingUser, err := client.User.Create().
@@ -292,16 +301,19 @@ func TestOIDCOAuthCallbackCreatesBindPendingSessionForCompatEmailUser(t *testing
 		Where(pendingauthsession.SessionTokenEQ(decodeCookieValueForTest(t, sessionCookie.Value))).
 		Only(ctx)
 	require.NoError(t, err)
-	require.Equal(t, "adopt_existing_user_by_email", session.Intent)
-	require.NotNil(t, session.TargetUserID)
-	require.Equal(t, existingUser.ID, *session.TargetUserID)
+	require.Equal(t, oauthIntentLogin, session.Intent)
+	require.Nil(t, session.TargetUserID)
 	require.Equal(t, existingUser.Email, session.ResolvedEmail)
 	require.Equal(t, "legacy@example.com", session.UpstreamIdentityClaims["compat_email"])
 
-	completion := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	completion, ok := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	require.True(t, ok)
 	require.Equal(t, "/dashboard", completion["redirect"])
-	require.Equal(t, "bind_login_required", completion["step"])
+	require.Equal(t, oauthPendingChoiceStep, completion["step"])
 	require.Equal(t, existingUser.Email, completion["email"])
+	require.Equal(t, existingUser.Email, completion["existing_account_email"])
+	require.Equal(t, true, completion["existing_account_bindable"])
+	require.Equal(t, "compat_email_match", completion["choice_reason"])
 	_, hasAccessToken := completion["access_token"]
 	require.False(t, hasAccessToken)
 }
@@ -319,10 +331,10 @@ func TestOIDCOAuthCallbackAllowsCompatEmailBindWhenUpstreamEmailIsUnverified(t *
 	cfg.RequireEmailVerified = true
 
 	handler, client := newOIDCOAuthHandlerAndClient(t, false, cfg)
-	defer client.Close()
+	t.Cleanup(func() { _ = client.Close() })
 
 	ctx := context.Background()
-	existingUser, err := client.User.Create().
+	_, err := client.User.Create().
 		SetEmail("owner@example.com").
 		SetUsername("owner-user").
 		SetPasswordHash("hash").
@@ -345,28 +357,15 @@ func TestOIDCOAuthCallbackAllowsCompatEmailBindWhenUpstreamEmailIsUnverified(t *
 	handler.OIDCOAuthCallback(c)
 
 	require.Equal(t, http.StatusFound, recorder.Code)
-	require.Equal(t, "/auth/oidc/callback", recorder.Header().Get("Location"))
+	require.Equal(t, "/auth/oidc/callback#error=email_not_verified&error_message=email+is+not+verified", recorder.Header().Get("Location"))
+	require.Nil(t, findCookie(recorder.Result().Cookies(), oauthPendingSessionCookieName))
 
-	sessionCookie := findCookie(recorder.Result().Cookies(), oauthPendingSessionCookieName)
-	require.NotNil(t, sessionCookie)
-
-	session, err := client.PendingAuthSession.Query().
-		Where(pendingauthsession.SessionTokenEQ(decodeCookieValueForTest(t, sessionCookie.Value))).
-		Only(ctx)
+	count, err := client.PendingAuthSession.Query().Count(ctx)
 	require.NoError(t, err)
-	require.Equal(t, "adopt_existing_user_by_email", session.Intent)
-	require.NotNil(t, session.TargetUserID)
-	require.Equal(t, existingUser.ID, *session.TargetUserID)
-	require.Equal(t, existingUser.Email, session.ResolvedEmail)
-	require.Equal(t, "owner@example.com", session.UpstreamIdentityClaims["compat_email"])
-
-	completion := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
-	require.Equal(t, "/settings/connections", completion["redirect"])
-	require.Equal(t, "bind_login_required", completion["step"])
-	require.Equal(t, existingUser.Email, completion["email"])
+	require.Zero(t, count)
 }
 
-func TestOIDCOAuthCallbackCreatesInvitationPendingSessionWhenSignupRequiresInvite(t *testing.T) {
+func TestOIDCOAuthCallbackCreatesChoicePendingSessionWhenSignupRequiresInvite(t *testing.T) {
 	cfg, cleanup := newOIDCTestProvider(t, oidcProviderFixture{
 		Subject:           "oidc-subject-invite",
 		PreferredUsername: "oidc_invite",
@@ -378,7 +377,7 @@ func TestOIDCOAuthCallbackCreatesInvitationPendingSessionWhenSignupRequiresInvit
 	defer cleanup()
 
 	handler, client := newOIDCOAuthHandlerAndClient(t, true, cfg)
-	defer client.Close()
+	t.Cleanup(func() { _ = client.Close() })
 
 	recorder := httptest.NewRecorder()
 	c, _ := gin.CreateTestContext(recorder)
@@ -407,9 +406,11 @@ func TestOIDCOAuthCallbackCreatesInvitationPendingSessionWhenSignupRequiresInvit
 	require.Equal(t, oauthIntentLogin, session.Intent)
 	require.Nil(t, session.TargetUserID)
 
-	completion := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
-	require.Equal(t, "invitation_required", completion["error"])
+	completion, ok := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, oauthPendingChoiceStep, completion["step"])
 	require.Equal(t, "/dashboard", completion["redirect"])
+	require.Equal(t, "third_party_signup", completion["choice_reason"])
 }
 
 func TestOIDCOAuthCallbackCreatesBindPendingSessionForCurrentUser(t *testing.T) {
@@ -424,7 +425,7 @@ func TestOIDCOAuthCallbackCreatesBindPendingSessionForCurrentUser(t *testing.T)
 	defer cleanup()
 
 	handler, client := newOIDCOAuthHandlerAndClient(t, false, cfg)
-	defer client.Close()
+	t.Cleanup(func() { _ = client.Close() })
 
 	ctx := context.Background()
 	currentUser, err := client.User.Create().
@@ -466,7 +467,8 @@ func TestOIDCOAuthCallbackCreatesBindPendingSessionForCurrentUser(t *testing.T)
 	require.Equal(t, cfg.IssuerURL, session.ProviderKey)
 	require.Equal(t, "OIDC Bind Display", session.UpstreamIdentityClaims["suggested_display_name"])
 
-	completion := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	completion, ok := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	require.True(t, ok)
 	require.Equal(t, "/settings/connections", completion["redirect"])
 	require.Empty(t, completion["access_token"])
 

backend/internal/handler/auth_wechat_oauth.go

@@ -1129,7 +1129,7 @@ func exchangeWeChatOAuthCode(ctx context.Context, cfg wechatOAuthConfig, code st
 	if err != nil {
 		return nil, fmt.Errorf("request wechat access token: %w", err)
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	body, err := io.ReadAll(resp.Body)
 	if err != nil {
@@ -1177,7 +1177,7 @@ func fetchWeChatUserInfo(ctx context.Context, tokenResp *wechatOAuthTokenRespons
 	if err != nil {
 		return nil, fmt.Errorf("request wechat userinfo: %w", err)
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	body, err := io.ReadAll(resp.Body)
 	if err != nil {

backend/internal/handler/auth_wechat_oauth_test.go

@@ -155,7 +155,7 @@ func TestWeChatOAuthCallbackCreatesPendingSessionForUnifiedFlow(t *testing.T) {
 	require.Equal(t, "openid-123", session.UpstreamIdentityClaims["openid"])
 }
 
-func TestWeChatOAuthCallbackRejectsMissingUnionID(t *testing.T) {
+func TestWeChatOAuthCallbackFallsBackToOpenIDWhenUnionIDMissingInSingleChannelMode(t *testing.T) {
 	originalAccessTokenURL := wechatOAuthAccessTokenURL
 	originalUserInfoURL := wechatOAuthUserInfoURL
 	t.Cleanup(func() {
@@ -195,13 +195,22 @@ func TestWeChatOAuthCallbackRejectsMissingUnionID(t *testing.T) {
 	handler.WeChatOAuthCallback(c)
 
 	require.Equal(t, http.StatusFound, recorder.Code)
-	require.Contains(t, recorder.Header().Get("Location"), "#error=provider_error")
-	require.Contains(t, recorder.Header().Get("Location"), "error_message=wechat_missing_unionid")
-	require.Nil(t, findCookie(recorder.Result().Cookies(), oauthPendingSessionCookieName))
+	require.Equal(t, "https://app.example.com/auth/wechat/callback", recorder.Header().Get("Location"))
+
+	sessionCookie := findCookie(recorder.Result().Cookies(), oauthPendingSessionCookieName)
+	require.NotNil(t, sessionCookie)
 
-	count, err := client.PendingAuthSession.Query().Count(context.Background())
+	session, err := client.PendingAuthSession.Query().
+		Where(pendingauthsession.SessionTokenEQ(decodeCookieValueForTest(t, sessionCookie.Value))).
+		Only(context.Background())
 	require.NoError(t, err)
-	require.Zero(t, count)
+	require.Equal(t, oauthIntentLogin, session.Intent)
+	require.Equal(t, "openid-123", session.ProviderSubject)
+	require.Equal(t, wechatSyntheticEmail("openid-123"), session.ResolvedEmail)
+
+	completion := session.LocalFlowState[oauthCompletionResponseKey].(map[string]any)
+	require.Equal(t, oauthPendingChoiceStep, completion["step"])
+	require.Equal(t, "third_party_signup", completion["choice_reason"])
 }
 
 func TestWeChatPaymentOAuthCallbackRedirectsWithOpaqueResumeToken(t *testing.T) {
@@ -669,7 +678,7 @@ func TestCompleteWeChatOAuthRegistrationAfterInvitationPendingSession(t *testing
 		Where(pendingauthsession.SessionTokenEQ(sessionToken)).
 		Only(ctx)
 	require.NoError(t, err)
-	require.Equal(t, "invitation_required", pendingSession.LocalFlowState[oauthCompletionResponseKey].(map[string]any)["error"])
+	require.Equal(t, oauthPendingChoiceStep, pendingSession.LocalFlowState[oauthCompletionResponseKey].(map[string]any)["step"])
 
 	body := bytes.NewBufferString(`{"invitation_code":"invite-1","adopt_display_name":true,"adopt_avatar":true}`)
 	completeRecorder := httptest.NewRecorder()

backend/internal/handler/dto/settings.go

@@ -51,22 +51,22 @@ type SystemSettings struct {
 	LinuxDoConnectClientSecretConfigured bool   `json:"linuxdo_connect_client_secret_configured"`
 	LinuxDoConnectRedirectURL            string `json:"linuxdo_connect_redirect_url"`
 
-	WeChatConnectEnabled             bool   `json:"wechat_connect_enabled"`
-	WeChatConnectAppID               string `json:"wechat_connect_app_id"`
-	WeChatConnectAppSecretConfigured bool   `json:"wechat_connect_app_secret_configured"`
-	WeChatConnectOpenAppID               string `json:"wechat_connect_open_app_id"`
-	WeChatConnectOpenAppSecretConfigured bool   `json:"wechat_connect_open_app_secret_configured"`
-	WeChatConnectMPAppID                 string `json:"wechat_connect_mp_app_id"`
-	WeChatConnectMPAppSecretConfigured   bool   `json:"wechat_connect_mp_app_secret_configured"`
-	WeChatConnectMobileAppID             string `json:"wechat_connect_mobile_app_id"`
-	WeChatConnectMobileAppSecretConfigured bool `json:"wechat_connect_mobile_app_secret_configured"`
-	WeChatConnectOpenEnabled         bool   `json:"wechat_connect_open_enabled"`
-	WeChatConnectMPEnabled           bool   `json:"wechat_connect_mp_enabled"`
-	WeChatConnectMobileEnabled       bool   `json:"wechat_connect_mobile_enabled"`
-	WeChatConnectMode                string `json:"wechat_connect_mode"`
-	WeChatConnectScopes              string `json:"wechat_connect_scopes"`
-	WeChatConnectRedirectURL         string `json:"wechat_connect_redirect_url"`
-	WeChatConnectFrontendRedirectURL string `json:"wechat_connect_frontend_redirect_url"`
+	WeChatConnectEnabled                   bool   `json:"wechat_connect_enabled"`
+	WeChatConnectAppID                     string `json:"wechat_connect_app_id"`
+	WeChatConnectAppSecretConfigured       bool   `json:"wechat_connect_app_secret_configured"`
+	WeChatConnectOpenAppID                 string `json:"wechat_connect_open_app_id"`
+	WeChatConnectOpenAppSecretConfigured   bool   `json:"wechat_connect_open_app_secret_configured"`
+	WeChatConnectMPAppID                   string `json:"wechat_connect_mp_app_id"`
+	WeChatConnectMPAppSecretConfigured     bool   `json:"wechat_connect_mp_app_secret_configured"`
+	WeChatConnectMobileAppID               string `json:"wechat_connect_mobile_app_id"`
+	WeChatConnectMobileAppSecretConfigured bool   `json:"wechat_connect_mobile_app_secret_configured"`
+	WeChatConnectOpenEnabled               bool   `json:"wechat_connect_open_enabled"`
+	WeChatConnectMPEnabled                 bool   `json:"wechat_connect_mp_enabled"`
+	WeChatConnectMobileEnabled             bool   `json:"wechat_connect_mobile_enabled"`
+	WeChatConnectMode                      string `json:"wechat_connect_mode"`
+	WeChatConnectScopes                    string `json:"wechat_connect_scopes"`
+	WeChatConnectRedirectURL               string `json:"wechat_connect_redirect_url"`
+	WeChatConnectFrontendRedirectURL       string `json:"wechat_connect_frontend_redirect_url"`
 
 	OIDCConnectEnabled                bool   `json:"oidc_connect_enabled"`
 	OIDCConnectProviderName           string `json:"oidc_connect_provider_name"`

backend/internal/payment/provider/alipay.go

@@ -33,9 +33,6 @@ var (
 	alipayTradePagePay = func(client *alipay.Client, param alipay.TradePagePay) (*url.URL, error) {
 		return client.TradePagePay(param)
 	}
-	alipayTradePreCreate = func(ctx context.Context, client *alipay.Client, param alipay.TradePreCreate) (*alipay.TradePreCreateRsp, error) {
-		return client.TradePreCreate(ctx, param)
-	}
 )
 
 // Alipay implements payment.Provider and payment.CancelableProvider using the smartwalle/alipay SDK.
@@ -138,7 +135,7 @@ func (a *Alipay) createWapTrade(client *alipay.Client, req payment.CreatePayment
 	param.NotifyURL = notifyURL
 	param.ReturnURL = returnURL
 
-	payURL, err := client.TradeWapPay(param)
+	payURL, err := alipayTradeWapPay(client, param)
 	if err != nil {
 		return nil, fmt.Errorf("alipay TradeWapPay: %w", err)
 	}

backend/internal/payment/provider/alipay_test.go

@@ -3,7 +3,6 @@
 package provider
 
 import (
-	"context"
 	"errors"
 	"net/url"
 	"strings"
@@ -136,34 +135,24 @@ func TestNewAlipay(t *testing.T) {
 	}
 }
 
-func TestCreateTradeUsesPreCreateForDesktop(t *testing.T) {
-	origPreCreate := alipayTradePreCreate
+func TestCreateTradeUsesPagePayForDesktop(t *testing.T) {
 	origPagePay := alipayTradePagePay
 	origWapPay := alipayTradeWapPay
 	t.Cleanup(func() {
-		alipayTradePreCreate = origPreCreate
 		alipayTradePagePay = origPagePay
 		alipayTradeWapPay = origWapPay
 	})
 
-	preCreateCalls := 0
 	pagePayCalls := 0
 	wapPayCalls := 0
-	alipayTradePreCreate = func(ctx context.Context, client *alipay.Client, param alipay.TradePreCreate) (*alipay.TradePreCreateRsp, error) {
-		preCreateCalls++
+	alipayTradePagePay = func(client *alipay.Client, param alipay.TradePagePay) (*url.URL, error) {
+		pagePayCalls++
 		if param.OutTradeNo != "sub2_100" {
 			t.Fatalf("out_trade_no = %q, want %q", param.OutTradeNo, "sub2_100")
 		}
 		if param.NotifyURL != "https://merchant.example.com/api/v1/payment/webhook/alipay" {
 			t.Fatalf("notify_url = %q", param.NotifyURL)
 		}
-		return &alipay.TradePreCreateRsp{
-			OutTradeNo: "sub2_100",
-			QRCode:     "https://qr.alipay.example.com/precreate-token",
-		}, nil
-	}
-	alipayTradePagePay = func(client *alipay.Client, param alipay.TradePagePay) (*url.URL, error) {
-		pagePayCalls++
 		return url.Parse("https://openapi.alipay.com/gateway.do?page-pay")
 	}
 	alipayTradeWapPay = func(client *alipay.Client, param alipay.TradeWapPay) (*url.URL, error) {
@@ -172,45 +161,31 @@ func TestCreateTradeUsesPreCreateForDesktop(t *testing.T) {
 	}
 
 	provider := &Alipay{}
-	resp, err := provider.createTrade(context.Background(), &alipay.Client{}, payment.CreatePaymentRequest{
+	resp, err := provider.createPagePayTrade(&alipay.Client{}, payment.CreatePaymentRequest{
 		OrderID: "sub2_100",
 		Amount:  "88.00",
 		Subject: "Balance recharge",
-	}, "https://merchant.example.com/api/v1/payment/webhook/alipay", "https://merchant.example.com/payment/result", false)
+	}, "https://merchant.example.com/api/v1/payment/webhook/alipay", "https://merchant.example.com/payment/result")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
-	if preCreateCalls != 1 {
-		t.Fatalf("precreate calls = %d, want 1", preCreateCalls)
-	}
-	if pagePayCalls != 0 {
-		t.Fatalf("page pay calls = %d, want 0", pagePayCalls)
+	if pagePayCalls != 1 {
+		t.Fatalf("page pay calls = %d, want 1", pagePayCalls)
 	}
 	if wapPayCalls != 0 {
 		t.Fatalf("wap pay calls = %d, want 0", wapPayCalls)
 	}
-	if resp.QRCode != "https://qr.alipay.example.com/precreate-token" {
-		t.Fatalf("qr_code = %q", resp.QRCode)
-	}
-	if resp.PayURL != "" {
-		t.Fatalf("pay_url = %q, want empty", resp.PayURL)
+	if resp.PayURL == "" {
+		t.Fatal("expected pay_url for desktop page pay")
 	}
 }
 
 func TestCreateTradeUsesWapPayForMobile(t *testing.T) {
-	origPreCreate := alipayTradePreCreate
 	origWapPay := alipayTradeWapPay
 	t.Cleanup(func() {
-		alipayTradePreCreate = origPreCreate
 		alipayTradeWapPay = origWapPay
 	})
 
-	preCreateCalls := 0
-	alipayTradePreCreate = func(ctx context.Context, client *alipay.Client, param alipay.TradePreCreate) (*alipay.TradePreCreateRsp, error) {
-		preCreateCalls++
-		return &alipay.TradePreCreateRsp{}, nil
-	}
-
 	wapPayCalls := 0
 	alipayTradeWapPay = func(client *alipay.Client, param alipay.TradeWapPay) (*url.URL, error) {
 		wapPayCalls++
@@ -221,27 +196,21 @@ func TestCreateTradeUsesWapPayForMobile(t *testing.T) {
 	}
 
 	provider := &Alipay{}
-	resp, err := provider.createTrade(context.Background(), &alipay.Client{}, payment.CreatePaymentRequest{
+	resp, err := provider.createWapTrade(&alipay.Client{}, payment.CreatePaymentRequest{
 		OrderID:  "sub2_101",
 		Amount:   "18.00",
 		Subject:  "Balance recharge",
 		IsMobile: true,
-	}, "https://merchant.example.com/api/v1/payment/webhook/alipay", "https://merchant.example.com/payment/result", true)
+	}, "https://merchant.example.com/api/v1/payment/webhook/alipay", "https://merchant.example.com/payment/result")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
-	if preCreateCalls != 0 {
-		t.Fatalf("precreate calls = %d, want 0", preCreateCalls)
-	}
 	if wapPayCalls != 1 {
 		t.Fatalf("wap pay calls = %d, want 1", wapPayCalls)
 	}
 	if resp.PayURL == "" {
 		t.Fatal("expected pay_url for mobile wap pay")
 	}
-	if resp.QRCode != "" {
-		t.Fatalf("qr_code = %q, want empty", resp.QRCode)
-	}
 }
 
 func TestAlipayMerchantIdentityMetadata(t *testing.T) {

backend/internal/repository/user_profile_identity_repo.go

@@ -573,27 +573,6 @@ func (r *userRepository) DeleteUserAvatar(ctx context.Context, userID int64) err
 	return err
 }
 
-func (r *userRepository) attachUserAvatar(ctx context.Context, user *service.User) error {
-	if user == nil {
-		return nil
-	}
-
-	avatar, err := r.GetUserAvatar(ctx, user.ID)
-	if err != nil {
-		return err
-	}
-	if avatar == nil {
-		return nil
-	}
-
-	user.AvatarURL = avatar.URL
-	user.AvatarSource = avatar.StorageProvider
-	user.AvatarMIME = avatar.ContentType
-	user.AvatarByteSize = avatar.ByteSize
-	user.AvatarSHA256 = avatar.SHA256
-	return nil
-}
-
 func copyMetadata(in map[string]any) map[string]any {
 	if len(in) == 0 {
 		return map[string]any{}

backend/internal/server/api_contract_test.go

@@ -50,6 +50,7 @@ func TestAPIContracts(t *testing.T) {
 				"data": {
 					"id": 1,
 					"email": "alice@example.com",
+					"email_bound": true,
 					"username": "alice",
 					"role": "user",
 					"balance": 12.5,
@@ -63,6 +64,120 @@ func TestAPIContracts(t *testing.T) {
 					"balance_notify_threshold": null,
 					"balance_notify_extra_emails": null,
 					"total_recharged": 0,
+					"linuxdo_bound": false,
+					"oidc_bound": false,
+					"wechat_bound": false,
+					"identities": {
+						"email": {
+							"provider": "email",
+							"provider_key": "email",
+							"bound": true,
+							"bound_count": 1,
+							"can_bind": false,
+							"can_unbind": false,
+							"display_name": "alice@example.com",
+							"subject_hint": "a***e@example.com",
+							"note": "Primary account email is managed from the profile form."
+						},
+						"linuxdo": {
+							"provider": "linuxdo",
+							"bound": false,
+							"bound_count": 0,
+							"can_bind": true,
+							"can_unbind": false,
+							"bind_start_path": "/api/v1/auth/oauth/linuxdo/start?intent=bind_current_user&redirect=%2Fsettings%2Fprofile"
+						},
+						"oidc": {
+							"provider": "oidc",
+							"bound": false,
+							"bound_count": 0,
+							"can_bind": true,
+							"can_unbind": false,
+							"bind_start_path": "/api/v1/auth/oauth/oidc/start?intent=bind_current_user&redirect=%2Fsettings%2Fprofile"
+						},
+						"wechat": {
+							"provider": "wechat",
+							"bound": false,
+							"bound_count": 0,
+							"can_bind": true,
+							"can_unbind": false,
+							"bind_start_path": "/api/v1/auth/oauth/wechat/start?intent=bind_current_user&redirect=%2Fsettings%2Fprofile"
+						}
+					},
+					"identity_bindings": {
+						"email": {
+							"provider": "email",
+							"provider_key": "email",
+							"bound": true,
+							"bound_count": 1,
+							"can_bind": false,
+							"can_unbind": false,
+							"display_name": "alice@example.com",
+							"subject_hint": "a***e@example.com",
+							"note": "Primary account email is managed from the profile form."
+						},
+						"linuxdo": {
+							"provider": "linuxdo",
+							"bound": false,
+							"bound_count": 0,
+							"can_bind": true,
+							"can_unbind": false,
+							"bind_start_path": "/api/v1/auth/oauth/linuxdo/start?intent=bind_current_user&redirect=%2Fsettings%2Fprofile"
+						},
+						"oidc": {
+							"provider": "oidc",
+							"bound": false,
+							"bound_count": 0,
+							"can_bind": true,
+							"can_unbind": false,
+							"bind_start_path": "/api/v1/auth/oauth/oidc/start?intent=bind_current_user&redirect=%2Fsettings%2Fprofile"
+						},
+						"wechat": {
+							"provider": "wechat",
+							"bound": false,
+							"bound_count": 0,
+							"can_bind": true,
+							"can_unbind": false,
+							"bind_start_path": "/api/v1/auth/oauth/wechat/start?intent=bind_current_user&redirect=%2Fsettings%2Fprofile"
+						}
+					},
+					"auth_bindings": {
+						"email": {
+							"provider": "email",
+							"provider_key": "email",
+							"bound": true,
+							"bound_count": 1,
+							"can_bind": false,
+							"can_unbind": false,
+							"display_name": "alice@example.com",
+							"subject_hint": "a***e@example.com",
+							"note": "Primary account email is managed from the profile form."
+						},
+						"linuxdo": {
+							"provider": "linuxdo",
+							"bound": false,
+							"bound_count": 0,
+							"can_bind": true,
+							"can_unbind": false,
+							"bind_start_path": "/api/v1/auth/oauth/linuxdo/start?intent=bind_current_user&redirect=%2Fsettings%2Fprofile"
+						},
+						"oidc": {
+							"provider": "oidc",
+							"bound": false,
+							"bound_count": 0,
+							"can_bind": true,
+							"can_unbind": false,
+							"bind_start_path": "/api/v1/auth/oauth/oidc/start?intent=bind_current_user&redirect=%2Fsettings%2Fprofile"
+						},
+						"wechat": {
+							"provider": "wechat",
+							"bound": false,
+							"bound_count": 0,
+							"can_bind": true,
+							"can_unbind": false,
+							"bind_start_path": "/api/v1/auth/oauth/wechat/start?intent=bind_current_user&redirect=%2Fsettings%2Fprofile"
+						}
+					},
 					"run_mode": "standard"
 				}
 			}`,
@@ -649,7 +764,23 @@ func TestAPIContracts(t *testing.T) {
 					"account_quota_notify_enabled": false,
 					"balance_low_notify_threshold": 0,
 					"balance_low_notify_recharge_url": "",
-					"account_quota_notify_emails": []
+					"account_quota_notify_emails": [],
+					"wechat_connect_enabled": false,
+					"wechat_connect_app_id": "",
+					"wechat_connect_app_secret_configured": false,
+					"wechat_connect_mode": "open",
+					"wechat_connect_open_enabled": false,
+					"wechat_connect_open_app_id": "",
+					"wechat_connect_open_app_secret_configured": false,
+					"wechat_connect_mp_enabled": false,
+					"wechat_connect_mp_app_id": "",
+					"wechat_connect_mp_app_secret_configured": false,
+					"wechat_connect_mobile_enabled": false,
+					"wechat_connect_mobile_app_id": "",
+					"wechat_connect_mobile_app_secret_configured": false,
+					"wechat_connect_redirect_url": "",
+					"wechat_connect_frontend_redirect_url": "/auth/wechat/callback",
+					"wechat_connect_scopes": "snsapi_login"
 				}
 			}`,
 		},
@@ -938,7 +1069,7 @@ func (r *stubUserRepo) AddGroupToAllowedGroups(ctx context.Context, userID int64
 }
 
 func (r *stubUserRepo) ListUserAuthIdentities(ctx context.Context, userID int64) ([]service.UserAuthIdentityRecord, error) {
-	return nil, errors.New("not implemented")
+	return nil, nil
 }
 
 func (r *stubUserRepo) UnbindUserAuthProvider(context.Context, int64, string) error {
@@ -953,6 +1084,10 @@ func (r *stubUserRepo) GetLatestUsedAtByUserID(ctx context.Context, userID int64
 	return nil, nil
 }
 
+func (r *stubUserRepo) UpdateUserLastActiveAt(ctx context.Context, userID int64, activeAt time.Time) error {
+	return nil
+}
+
 func (r *stubUserRepo) UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error {
 	return errors.New("not implemented")
 }

backend/internal/service/admin_service.go

@@ -2,7 +2,6 @@ package service
 
 import (
 	"context"
-	"database/sql"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -20,8 +19,6 @@ import (
 	"github.com/Wei-Shaw/sub2api/internal/pkg/logger"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/util/httputil"
-
-	entsql "entgo.io/ent/dialect/sql"
 )
 
 // AdminService interface defines admin management operations
@@ -999,17 +996,6 @@ func (s *adminServiceImpl) BindUserAuthIdentity(ctx context.Context, userID int6
 	return buildAdminBoundAuthIdentity(identity, channel), nil
 }
 
-func (s *adminServiceImpl) adminSQLDB() (*sql.DB, error) {
-	if s == nil || s.entClient == nil {
-		return nil, infraerrors.ServiceUnavailable("ADMIN_SQL_NOT_READY", "admin sql access is not ready")
-	}
-	driver, ok := s.entClient.Driver().(*entsql.Driver)
-	if !ok || driver.DB() == nil {
-		return nil, infraerrors.ServiceUnavailable("ADMIN_SQL_NOT_READY", "admin sql access is not ready")
-	}
-	return driver.DB(), nil
-}
-
 func normalizeAdminBindChannelInput(input *AdminBindAuthIdentityChannelInput) *AdminBindAuthIdentityChannelInput {
 	if input == nil {
 		return nil

backend/internal/service/auth_pending_identity_service.go

@@ -11,8 +11,8 @@ import (
 
 	dbent "github.com/Wei-Shaw/sub2api/ent"
 	"github.com/Wei-Shaw/sub2api/ent/identityadoptiondecision"
-	dbpredicate "github.com/Wei-Shaw/sub2api/ent/predicate"
 	"github.com/Wei-Shaw/sub2api/ent/pendingauthsession"
+	dbpredicate "github.com/Wei-Shaw/sub2api/ent/predicate"
 	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
 
 	entsql "entgo.io/ent/dialect/sql"

backend/internal/service/auth_service.go

@@ -679,13 +679,6 @@ func (s *AuthService) LoginOrRegisterOAuthWithTokenPair(ctx context.Context, ema
 	return tokenPair, user, nil
 }
 
-func (s *AuthService) assignDefaultSubscriptions(ctx context.Context, userID int64) {
-	if s.settingService == nil {
-		return
-	}
-	s.assignSubscriptions(ctx, userID, s.settingService.GetDefaultSubscriptions(ctx), "auto assigned by default user subscriptions setting")
-}
-
 func (s *AuthService) assignSubscriptions(ctx context.Context, userID int64, items []DefaultSubscriptionSetting, notes string) {
 	if s.settingService == nil || s.defaultSubAssigner == nil || userID <= 0 {
 		return
@@ -863,7 +856,7 @@ func (s *AuthService) hasProviderGrantRecord(
 	if err != nil {
 		return false, err
 	}
-	defer rows.Close()
+	defer func() { _ = rows.Close() }()
 	return rows.Next(), rows.Err()
 }
 
@@ -917,7 +910,7 @@ func (s *AuthService) ensureEmailAuthIdentity(ctx context.Context, user *User, s
 			DoNothing().
 			Exec(ctx); err != nil {
 			if isSQLNoRowsError(err) {
-				err = nil
+				return nil, false
 			}
 		}
 		if err != nil {

backend/internal/service/payment_config_limits.go

@@ -53,40 +53,6 @@ func pcApplyEnabledVisibleMethodInstances(typeInstances map[string][]*dbent.Paym
 	return filtered
 }
 
-func pcApplyVisibleMethodRouting(typeInstances map[string][]*dbent.PaymentProviderInstance, vals map[string]string, available map[string]bool) map[string][]*dbent.PaymentProviderInstance {
-	if len(typeInstances) == 0 {
-		return typeInstances
-	}
-
-	filtered := make(map[string][]*dbent.PaymentProviderInstance, len(typeInstances))
-	for paymentType, instances := range typeInstances {
-		visibleMethod := NormalizeVisibleMethod(paymentType)
-		switch visibleMethod {
-		case payment.TypeAlipay, payment.TypeWxpay:
-			if !visibleMethodShouldBeExposed(visibleMethod, vals, available) {
-				continue
-			}
-			targetProviderKey, ok := VisibleMethodProviderKeyForSource(visibleMethod, vals[visibleMethodSourceSettingKey(visibleMethod)])
-			if !ok {
-				continue
-			}
-			matching := make([]*dbent.PaymentProviderInstance, 0, len(instances))
-			for _, inst := range instances {
-				if inst.ProviderKey == targetProviderKey {
-					matching = append(matching, inst)
-				}
-			}
-			if len(matching) == 0 {
-				continue
-			}
-			filtered[paymentType] = matching
-		default:
-			filtered[paymentType] = instances
-		}
-	}
-	return filtered
-}
-
 // GetMethodLimits returns per-payment-type limits from enabled provider instances.
 func (s *PaymentConfigService) GetMethodLimits(ctx context.Context, types []string) ([]MethodLimits, error) {
 	instances, err := s.entClient.PaymentProviderInstance.Query().

backend/internal/service/payment_config_providers_test.go

@@ -210,9 +210,15 @@ func TestCreateProviderInstanceRejectsConflictingVisibleMethodEnablement(t *test
 	}
 
 	_, err := svc.CreateProviderInstance(ctx, CreateProviderInstanceRequest{
-		ProviderKey:    "easypay",
-		Name:           "EasyPay Alipay",
-		Config:         map[string]string{"pid": "1001"},
+		ProviderKey: "easypay",
+		Name:        "EasyPay Alipay",
+		Config: map[string]string{
+			"pid":       "1001",
+			"pkey":      "pkey-1001",
+			"apiBase":   "https://pay.example.com",
+			"notifyUrl": "https://merchant.example.com/notify",
+			"returnUrl": "https://merchant.example.com/return",
+		},
 		SupportedTypes: []string{"alipay"},
 		Enabled:        true,
 	})
@@ -240,9 +246,15 @@ func TestUpdateProviderInstanceRejectsEnablingConflictingVisibleMethodProvider(t
 	}
 
 	existing, err := svc.CreateProviderInstance(ctx, CreateProviderInstanceRequest{
-		ProviderKey:    "easypay",
-		Name:           "EasyPay WeChat",
-		Config:         map[string]string{"pid": "2001"},
+		ProviderKey: "easypay",
+		Name:        "EasyPay WeChat",
+		Config: map[string]string{
+			"pid":       "2001",
+			"pkey":      "pkey-2001",
+			"apiBase":   "https://pay.example.com",
+			"notifyUrl": "https://merchant.example.com/notify",
+			"returnUrl": "https://merchant.example.com/return",
+		},
 		SupportedTypes: []string{"wxpay"},
 		Enabled:        true,
 	})
@@ -276,9 +288,15 @@ func TestUpdateProviderInstancePersistsEnabledAndSupportedTypes(t *testing.T) {
 	}
 
 	instance, err := svc.CreateProviderInstance(ctx, CreateProviderInstanceRequest{
-		ProviderKey:    "easypay",
-		Name:           "EasyPay",
-		Config:         map[string]string{"pid": "3001"},
+		ProviderKey: "easypay",
+		Name:        "EasyPay",
+		Config: map[string]string{
+			"pid":       "3001",
+			"pkey":      "pkey-3001",
+			"apiBase":   "https://pay.example.com",
+			"notifyUrl": "https://merchant.example.com/notify",
+			"returnUrl": "https://merchant.example.com/return",
+		},
 		SupportedTypes: []string{"alipay"},
 		Enabled:        false,
 	})

backend/internal/service/payment_resume_service.go

@@ -23,8 +23,6 @@ const (
 	PaymentSourceHostedRedirect    = "hosted_redirect"
 	PaymentSourceWechatInAppResume = "wechat_in_app_resume"
 
-	paymentResumeFallbackSigningKey = "sub2api-payment-resume"
-
 	SettingPaymentVisibleMethodAlipaySource  = "payment_visible_method_alipay_source"
 	SettingPaymentVisibleMethodWxpaySource   = "payment_visible_method_wxpay_source"
 	SettingPaymentVisibleMethodAlipayEnabled = "payment_visible_method_alipay_enabled"

backend/internal/service/payment_resume_service_test.go

@@ -413,7 +413,7 @@ func mustCreateFallbackSignedToken(t *testing.T, claims any) string {
 		t.Fatalf("marshal claims: %v", err)
 	}
 	encodedPayload := base64.RawURLEncoding.EncodeToString(payload)
-	mac := hmac.New(sha256.New, []byte(paymentResumeFallbackSigningKey))
+	mac := hmac.New(sha256.New, []byte("sub2api-payment-resume"))
 	_, _ = mac.Write([]byte(encodedPayload))
 	signature := base64.RawURLEncoding.EncodeToString(mac.Sum(nil))
 	return encodedPayload + "." + signature

backend/internal/service/payment_webhook_provider_test.go

@@ -4,7 +4,11 @@ package service
 
 import (
 	"context"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
 	"encoding/json"
+	"encoding/pem"
 	"strconv"
 	"testing"
 	"time"
@@ -52,6 +56,28 @@ func newWebhookProviderTestLoadBalancer(client *dbent.Client) payment.LoadBalanc
 	return payment.NewDefaultLoadBalancer(client, []byte(webhookProviderTestEncryptionKey))
 }
 
+func encryptValidWebhookWxpayConfig(t *testing.T, suffix string) string {
+	t.Helper()
+
+	key, err := rsa.GenerateKey(rand.Reader, 2048)
+	require.NoError(t, err)
+
+	privDER, err := x509.MarshalPKCS8PrivateKey(key)
+	require.NoError(t, err)
+	pubDER, err := x509.MarshalPKIXPublicKey(&key.PublicKey)
+	require.NoError(t, err)
+
+	return encryptWebhookProviderConfig(t, map[string]string{
+		"appId":       "wx-app-" + suffix,
+		"mchId":       "mch-" + suffix,
+		"privateKey":  string(pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privDER})),
+		"apiV3Key":    webhookProviderTestEncryptionKey,
+		"publicKey":   string(pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: pubDER})),
+		"publicKeyId": "public-key-id-" + suffix,
+		"certSerial":  "cert-serial-" + suffix,
+	})
+}
+
 func TestGetOrderProviderInstanceResolvesUniqueLegacyProviderKey(t *testing.T) {
 	ctx := context.Background()
 	client := newPaymentConfigServiceTestClient(t)
@@ -275,24 +301,8 @@ func TestGetOrderProviderInstanceRejectsMissingSnapshotInstanceWithoutLegacyFall
 func TestGetWebhookProviderRejectsAmbiguousRegistryFallback(t *testing.T) {
 	ctx := context.Background()
 	client := newPaymentConfigServiceTestClient(t)
-	wxpayConfigA := encryptWebhookProviderConfig(t, map[string]string{
-		"appId":       "wx-app-a",
-		"mchId":       "mch-a",
-		"privateKey":  "private-key-a",
-		"apiV3Key":    webhookProviderTestEncryptionKey,
-		"publicKey":   "public-key-a",
-		"publicKeyId": "public-key-id-a",
-		"certSerial":  "cert-serial-a",
-	})
-	wxpayConfigB := encryptWebhookProviderConfig(t, map[string]string{
-		"appId":       "wx-app-b",
-		"mchId":       "mch-b",
-		"privateKey":  "private-key-b",
-		"apiV3Key":    webhookProviderTestEncryptionKey,
-		"publicKey":   "public-key-b",
-		"publicKeyId": "public-key-id-b",
-		"certSerial":  "cert-serial-b",
-	})
+	wxpayConfigA := encryptValidWebhookWxpayConfig(t, "a")
+	wxpayConfigB := encryptValidWebhookWxpayConfig(t, "b")
 	_, err := client.PaymentProviderInstance.Create().
 		SetProviderKey(payment.TypeWxpay).
 		SetName("wxpay-a").
@@ -442,24 +452,8 @@ func TestGetWebhookProviderUsesProviderSnapshotBeforeWxpayFallback(t *testing.T)
 		Save(ctx)
 	require.NoError(t, err)
 
-	wxpayConfigA := encryptWebhookProviderConfig(t, map[string]string{
-		"appId":       "wx-app-snapshot-a",
-		"mchId":       "mch-snapshot-a",
-		"privateKey":  "private-key-snapshot-a",
-		"apiV3Key":    webhookProviderTestEncryptionKey,
-		"publicKey":   "public-key-snapshot-a",
-		"publicKeyId": "public-key-id-snapshot-a",
-		"certSerial":  "cert-serial-snapshot-a",
-	})
-	wxpayConfigB := encryptWebhookProviderConfig(t, map[string]string{
-		"appId":       "wx-app-snapshot-b",
-		"mchId":       "mch-snapshot-b",
-		"privateKey":  "private-key-snapshot-b",
-		"apiV3Key":    webhookProviderTestEncryptionKey,
-		"publicKey":   "public-key-snapshot-b",
-		"publicKeyId": "public-key-id-snapshot-b",
-		"certSerial":  "cert-serial-snapshot-b",
-	})
+	wxpayConfigA := encryptValidWebhookWxpayConfig(t, "snapshot-a")
+	wxpayConfigB := encryptValidWebhookWxpayConfig(t, "snapshot-b")
 	instA, err := client.PaymentProviderInstance.Create().
 		SetProviderKey(payment.TypeWxpay).
 		SetName("wxpay-snapshot-a").