feat: drive visible payment methods from enabled providers

backend/internal/service/payment_config_limits.go

@@ -20,18 +20,7 @@ func (s *PaymentConfigService) GetAvailableMethodLimits(ctx context.Context) (*M
 		return nil, fmt.Errorf("query provider instances: %w", err)
 	}
 	typeInstances := pcGroupByPaymentType(instances)
-	if s.settingRepo != nil {
-		vals, err := s.settingRepo.GetMultiple(ctx, []string{
-			SettingPaymentVisibleMethodAlipayEnabled,
-			SettingPaymentVisibleMethodAlipaySource,
-			SettingPaymentVisibleMethodWxpayEnabled,
-			SettingPaymentVisibleMethodWxpaySource,
-		})
-		if err != nil {
-			return nil, fmt.Errorf("query visible method settings: %w", err)
-		}
-		typeInstances = pcApplyVisibleMethodRouting(typeInstances, vals, buildVisibleMethodSourceAvailability(instances))
-	}
+	typeInstances = pcApplyEnabledVisibleMethodInstances(typeInstances, instances)
 	resp := &MethodLimitsResponse{
 		Methods: make(map[string]MethodLimits, len(typeInstances)),
 	}
@@ -43,6 +32,27 @@ func (s *PaymentConfigService) GetAvailableMethodLimits(ctx context.Context) (*M
 	return resp, nil
 }
 
+func pcApplyEnabledVisibleMethodInstances(typeInstances map[string][]*dbent.PaymentProviderInstance, instances []*dbent.PaymentProviderInstance) map[string][]*dbent.PaymentProviderInstance {
+	if len(typeInstances) == 0 {
+		return typeInstances
+	}
+
+	filtered := make(map[string][]*dbent.PaymentProviderInstance, len(typeInstances))
+	for paymentType, groupedInstances := range typeInstances {
+		filtered[paymentType] = groupedInstances
+	}
+
+	for _, method := range []string{payment.TypeAlipay, payment.TypeWxpay} {
+		matching := filterEnabledVisibleMethodInstances(instances, method)
+		if len(matching) != 1 {
+			delete(filtered, method)
+			continue
+		}
+		filtered[method] = []*dbent.PaymentProviderInstance{matching[0]}
+	}
+	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

backend/internal/service/payment_config_limits_test.go

@@ -301,7 +301,7 @@ func TestPcInstanceTypeLimits(t *testing.T) {
 	})
 }
 
-func TestGetAvailableMethodLimitsRespectsVisibleMethodRouting(t *testing.T) {
+func TestGetAvailableMethodLimitsHidesConflictingVisibleMethodProviders(t *testing.T) {
 	ctx := context.Background()
 	client := newPaymentConfigServiceTestClient(t)
 
@@ -341,14 +341,6 @@ func TestGetAvailableMethodLimitsRespectsVisibleMethodRouting(t *testing.T) {
 
 	svc := &PaymentConfigService{
 		entClient: client,
-		settingRepo: &paymentConfigSettingRepoStub{
-			values: map[string]string{
-				SettingPaymentVisibleMethodAlipayEnabled: "true",
-				SettingPaymentVisibleMethodAlipaySource:  VisibleMethodSourceEasyPayAlipay,
-				SettingPaymentVisibleMethodWxpayEnabled:  "false",
-				SettingPaymentVisibleMethodWxpaySource:   VisibleMethodSourceOfficialWechat,
-			},
-		},
 	}
 
 	resp, err := svc.GetAvailableMethodLimits(ctx)
@@ -356,17 +348,18 @@ func TestGetAvailableMethodLimitsRespectsVisibleMethodRouting(t *testing.T) {
 		t.Fatalf("GetAvailableMethodLimits returned error: %v", err)
 	}
 
-	alipayLimits, ok := resp.Methods[payment.TypeAlipay]
-	if !ok {
-		t.Fatalf("expected visible alipay limits, got %v", resp.Methods)
+	if _, ok := resp.Methods[payment.TypeAlipay]; ok {
+		t.Fatalf("alipay should be hidden when multiple enabled providers claim it, got %v", resp.Methods[payment.TypeAlipay])
 	}
-	if alipayLimits.SingleMin != 20 || alipayLimits.SingleMax != 200 {
-		t.Fatalf("alipay limits = %+v, want easypay-only min=20 max=200", alipayLimits)
+
+	wxpayLimits, ok := resp.Methods[payment.TypeWxpay]
+	if !ok {
+		t.Fatalf("expected wxpay limits to remain visible, got %v", resp.Methods)
 	}
-	if _, ok := resp.Methods[payment.TypeWxpay]; ok {
-		t.Fatalf("wxpay should be hidden when visible method is disabled, got %v", resp.Methods[payment.TypeWxpay])
+	if wxpayLimits.SingleMin != 30 || wxpayLimits.SingleMax != 300 {
+		t.Fatalf("wxpay limits = %+v, want official-only min=30 max=300", wxpayLimits)
 	}
-	if resp.GlobalMin != 20 || resp.GlobalMax != 200 {
-		t.Fatalf("global range = (%v, %v), want (20, 200)", resp.GlobalMin, resp.GlobalMax)
+	if resp.GlobalMin != 30 || resp.GlobalMax != 300 {
+		t.Fatalf("global range = (%v, %v), want (30, 300)", resp.GlobalMin, resp.GlobalMax)
 	}
 }

backend/internal/service/payment_config_providers.go

@@ -108,6 +108,9 @@ func (s *PaymentConfigService) CreateProviderInstance(ctx context.Context, req C
 	if err := validateProviderRequest(req.ProviderKey, req.Name, typesStr); err != nil {
 		return nil, err
 	}
+	if err := s.validateVisibleMethodEnablementConflicts(ctx, 0, req.ProviderKey, typesStr, req.Enabled); err != nil {
+		return nil, err
+	}
 	enc, err := s.encryptConfig(req.Config)
 	if err != nil {
 		return nil, err
@@ -136,6 +139,21 @@ func validateProviderRequest(providerKey, name, supportedTypes string) error {
 // NOTE: This function exceeds 30 lines due to per-field nil-check patch update
 // boilerplate and pending-order safety checks.
 func (s *PaymentConfigService) UpdateProviderInstance(ctx context.Context, id int64, req UpdateProviderInstanceRequest) (*dbent.PaymentProviderInstance, error) {
+	current, err := s.entClient.PaymentProviderInstance.Get(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+	nextEnabled := current.Enabled
+	if req.Enabled != nil {
+		nextEnabled = *req.Enabled
+	}
+	nextSupportedTypes := current.SupportedTypes
+	if req.SupportedTypes != nil {
+		nextSupportedTypes = joinTypes(req.SupportedTypes)
+	}
+	if err := s.validateVisibleMethodEnablementConflicts(ctx, id, current.ProviderKey, nextSupportedTypes, nextEnabled); err != nil {
+		return nil, err
+	}
 	if req.Config != nil {
 		hasSensitive := false
 		for k := range req.Config {
@@ -188,11 +206,7 @@ func (s *PaymentConfigService) UpdateProviderInstance(ctx context.Context, id in
 		}
 		if count > 0 {
 			// Load current instance to compare types
-			inst, err := s.entClient.PaymentProviderInstance.Get(ctx, id)
-			if err != nil {
-				return nil, fmt.Errorf("load provider instance: %w", err)
-			}
-			oldTypes := strings.Split(inst.SupportedTypes, ",")
+			oldTypes := strings.Split(current.SupportedTypes, ",")
 			newTypes := req.SupportedTypes
 			for _, ot := range oldTypes {
 				ot = strings.TrimSpace(ot)
@@ -237,10 +251,7 @@ func (s *PaymentConfigService) UpdateProviderInstance(ctx context.Context, id in
 			if req.RefundEnabled != nil {
 				refundEnabled = *req.RefundEnabled
 			} else {
-				inst, err := s.entClient.PaymentProviderInstance.Get(ctx, id)
-				if err == nil {
-					refundEnabled = inst.RefundEnabled
-				}
+				refundEnabled = current.RefundEnabled
 			}
 			if refundEnabled {
 				u.SetAllowUserRefund(true)

backend/internal/service/payment_config_providers_test.go

@@ -3,8 +3,10 @@
 package service
 
 import (
+	"context"
 	"testing"
 
+	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -185,3 +187,104 @@ func TestJoinTypes(t *testing.T) {
 		})
 	}
 }
+
+func TestCreateProviderInstanceRejectsConflictingVisibleMethodEnablement(t *testing.T) {
+	t.Parallel()
+
+	ctx := context.Background()
+	client := newPaymentConfigServiceTestClient(t)
+	svc := &PaymentConfigService{
+		entClient:     client,
+		encryptionKey: []byte("0123456789abcdef0123456789abcdef"),
+	}
+
+	_, err := svc.CreateProviderInstance(ctx, CreateProviderInstanceRequest{
+		ProviderKey:    "easypay",
+		Name:           "EasyPay Alipay",
+		Config:         map[string]string{"pid": "1001"},
+		SupportedTypes: []string{"alipay"},
+		Enabled:        true,
+	})
+	require.NoError(t, err)
+
+	_, err = svc.CreateProviderInstance(ctx, CreateProviderInstanceRequest{
+		ProviderKey:    "alipay",
+		Name:           "Official Alipay",
+		Config:         map[string]string{"appId": "app-1"},
+		SupportedTypes: []string{"alipay"},
+		Enabled:        true,
+	})
+	require.Error(t, err)
+	require.Equal(t, "PAYMENT_PROVIDER_CONFLICT", infraerrors.Reason(err))
+}
+
+func TestUpdateProviderInstanceRejectsEnablingConflictingVisibleMethodProvider(t *testing.T) {
+	t.Parallel()
+
+	ctx := context.Background()
+	client := newPaymentConfigServiceTestClient(t)
+	svc := &PaymentConfigService{
+		entClient:     client,
+		encryptionKey: []byte("0123456789abcdef0123456789abcdef"),
+	}
+
+	existing, err := svc.CreateProviderInstance(ctx, CreateProviderInstanceRequest{
+		ProviderKey:    "easypay",
+		Name:           "EasyPay WeChat",
+		Config:         map[string]string{"pid": "2001"},
+		SupportedTypes: []string{"wxpay"},
+		Enabled:        true,
+	})
+	require.NoError(t, err)
+	require.NotNil(t, existing)
+
+	candidate, err := svc.CreateProviderInstance(ctx, CreateProviderInstanceRequest{
+		ProviderKey:    "wxpay",
+		Name:           "Official WeChat",
+		Config:         map[string]string{"appId": "wx-app"},
+		SupportedTypes: []string{"wxpay"},
+		Enabled:        false,
+	})
+	require.NoError(t, err)
+
+	_, err = svc.UpdateProviderInstance(ctx, candidate.ID, UpdateProviderInstanceRequest{
+		Enabled: boolPtrValue(true),
+	})
+	require.Error(t, err)
+	require.Equal(t, "PAYMENT_PROVIDER_CONFLICT", infraerrors.Reason(err))
+}
+
+func TestUpdateProviderInstancePersistsEnabledAndSupportedTypes(t *testing.T) {
+	t.Parallel()
+
+	ctx := context.Background()
+	client := newPaymentConfigServiceTestClient(t)
+	svc := &PaymentConfigService{
+		entClient:     client,
+		encryptionKey: []byte("0123456789abcdef0123456789abcdef"),
+	}
+
+	instance, err := svc.CreateProviderInstance(ctx, CreateProviderInstanceRequest{
+		ProviderKey:    "easypay",
+		Name:           "EasyPay",
+		Config:         map[string]string{"pid": "3001"},
+		SupportedTypes: []string{"alipay"},
+		Enabled:        false,
+	})
+	require.NoError(t, err)
+
+	_, err = svc.UpdateProviderInstance(ctx, instance.ID, UpdateProviderInstanceRequest{
+		Enabled:        boolPtrValue(true),
+		SupportedTypes: []string{"alipay", "wxpay"},
+	})
+	require.NoError(t, err)
+
+	saved, err := client.PaymentProviderInstance.Get(ctx, instance.ID)
+	require.NoError(t, err)
+	require.True(t, saved.Enabled)
+	require.Equal(t, "alipay,wxpay", saved.SupportedTypes)
+}
+
+func boolPtrValue(v bool) *bool {
+	return &v
+}

backend/internal/service/payment_config_service.go

@@ -209,17 +209,6 @@ func (s *PaymentConfigService) GetPaymentConfig(ctx context.Context) (*PaymentCo
 		return nil, fmt.Errorf("get payment config settings: %w", err)
 	}
 	cfg := s.parsePaymentConfig(vals)
-	if s.entClient != nil {
-		instances, err := s.entClient.PaymentProviderInstance.Query().
-			Where(paymentproviderinstance.EnabledEQ(true)).
-			All(ctx)
-		if err != nil {
-			return nil, fmt.Errorf("list enabled provider instances: %w", err)
-		}
-		cfg.EnabledTypes = applyVisibleMethodRoutingToEnabledTypes(cfg.EnabledTypes, vals, buildVisibleMethodSourceAvailability(instances))
-	} else {
-		cfg.EnabledTypes = applyVisibleMethodRoutingToEnabledTypes(cfg.EnabledTypes, vals, nil)
-	}
 	// Load Stripe publishable key from the first enabled Stripe provider instance
 	cfg.StripePublishableKey = s.getStripePublishableKey(ctx)
 	return cfg, nil
@@ -305,25 +294,25 @@ func (s *PaymentConfigService) UpdatePaymentConfig(ctx context.Context, req Upda
 		}
 	}
 	m := map[string]string{
-		SettingPaymentEnabled:      formatBoolOrEmpty(req.Enabled),
-		SettingMinRechargeAmount:   formatPositiveFloat(req.MinAmount),
-		SettingMaxRechargeAmount:   formatPositiveFloat(req.MaxAmount),
-		SettingDailyRechargeLimit:  formatPositiveFloat(req.DailyLimit),
-		SettingOrderTimeoutMinutes: formatPositiveInt(req.OrderTimeoutMin),
-		SettingMaxPendingOrders:    formatPositiveInt(req.MaxPendingOrders),
-		SettingBalancePayDisabled:  formatBoolOrEmpty(req.BalanceDisabled),
-		SettingBalanceRechargeMult: formatPositiveFloat(req.BalanceRechargeMultiplier),
-		SettingRechargeFeeRate:     formatNonNegativeFloat(req.RechargeFeeRate),
-		SettingLoadBalanceStrategy: derefStr(req.LoadBalanceStrategy),
-		SettingProductNamePrefix:   derefStr(req.ProductNamePrefix),
-		SettingProductNameSuffix:   derefStr(req.ProductNameSuffix),
-		SettingHelpImageURL:        derefStr(req.HelpImageURL),
-		SettingHelpText:            derefStr(req.HelpText),
-		SettingCancelRateLimitOn:   formatBoolOrEmpty(req.CancelRateLimitEnabled),
-		SettingCancelRateLimitMax:  formatPositiveInt(req.CancelRateLimitMax),
-		SettingCancelWindowSize:    formatPositiveInt(req.CancelRateLimitWindow),
-		SettingCancelWindowUnit:    derefStr(req.CancelRateLimitUnit),
-		SettingCancelWindowMode:    derefStr(req.CancelRateLimitMode),
+		SettingPaymentEnabled:                    formatBoolOrEmpty(req.Enabled),
+		SettingMinRechargeAmount:                 formatPositiveFloat(req.MinAmount),
+		SettingMaxRechargeAmount:                 formatPositiveFloat(req.MaxAmount),
+		SettingDailyRechargeLimit:                formatPositiveFloat(req.DailyLimit),
+		SettingOrderTimeoutMinutes:               formatPositiveInt(req.OrderTimeoutMin),
+		SettingMaxPendingOrders:                  formatPositiveInt(req.MaxPendingOrders),
+		SettingBalancePayDisabled:                formatBoolOrEmpty(req.BalanceDisabled),
+		SettingBalanceRechargeMult:               formatPositiveFloat(req.BalanceRechargeMultiplier),
+		SettingRechargeFeeRate:                   formatNonNegativeFloat(req.RechargeFeeRate),
+		SettingLoadBalanceStrategy:               derefStr(req.LoadBalanceStrategy),
+		SettingProductNamePrefix:                 derefStr(req.ProductNamePrefix),
+		SettingProductNameSuffix:                 derefStr(req.ProductNameSuffix),
+		SettingHelpImageURL:                      derefStr(req.HelpImageURL),
+		SettingHelpText:                          derefStr(req.HelpText),
+		SettingCancelRateLimitOn:                 formatBoolOrEmpty(req.CancelRateLimitEnabled),
+		SettingCancelRateLimitMax:                formatPositiveInt(req.CancelRateLimitMax),
+		SettingCancelWindowSize:                  formatPositiveInt(req.CancelRateLimitWindow),
+		SettingCancelWindowUnit:                  derefStr(req.CancelRateLimitUnit),
+		SettingCancelWindowMode:                  derefStr(req.CancelRateLimitMode),
 		SettingPaymentVisibleMethodAlipaySource:  derefStr(req.VisibleMethodAlipaySource),
 		SettingPaymentVisibleMethodWxpaySource:   derefStr(req.VisibleMethodWxpaySource),
 		SettingPaymentVisibleMethodAlipayEnabled: formatBoolOrEmpty(req.VisibleMethodAlipayEnabled),

backend/internal/service/payment_config_service_test.go

@@ -3,6 +3,8 @@ package service
 import (
 	"context"
 	"database/sql"
+	"fmt"
+	"strings"
 	"testing"
 
 	dbent "github.com/Wei-Shaw/sub2api/ent"
@@ -302,7 +304,7 @@ func TestBuildVisibleMethodSourceAvailability(t *testing.T) {
 	}
 }
 
-func TestGetPaymentConfigAppliesVisibleMethodRouting(t *testing.T) {
+func TestGetPaymentConfigKeepsStoredEnabledTypes(t *testing.T) {
 	ctx := context.Background()
 	client := newPaymentConfigServiceTestClient(t)
 
@@ -321,11 +323,7 @@ func TestGetPaymentConfigAppliesVisibleMethodRouting(t *testing.T) {
 		entClient: client,
 		settingRepo: &paymentConfigSettingRepoStub{
 			values: map[string]string{
-				SettingEnabledPaymentTypes:               "alipay,wxpay,stripe",
-				SettingPaymentVisibleMethodAlipayEnabled: "true",
-				SettingPaymentVisibleMethodAlipaySource:  "easypay",
-				SettingPaymentVisibleMethodWxpayEnabled:  "true",
-				SettingPaymentVisibleMethodWxpaySource:   "wxpay",
+				SettingEnabledPaymentTypes: "alipay,wxpay,stripe",
 			},
 		},
 	}
@@ -335,7 +333,7 @@ func TestGetPaymentConfigAppliesVisibleMethodRouting(t *testing.T) {
 		t.Fatalf("GetPaymentConfig returned error: %v", err)
 	}
 
-	want := []string{payment.TypeAlipay, payment.TypeStripe}
+	want := []string{payment.TypeAlipay, payment.TypeWxpay, payment.TypeStripe}
 	if len(cfg.EnabledTypes) != len(want) {
 		t.Fatalf("EnabledTypes len = %d, want %d (%v)", len(cfg.EnabledTypes), len(want), cfg.EnabledTypes)
 	}
@@ -349,7 +347,11 @@ func TestGetPaymentConfigAppliesVisibleMethodRouting(t *testing.T) {
 func newPaymentConfigServiceTestClient(t *testing.T) *dbent.Client {
 	t.Helper()
 
-	db, err := sql.Open("sqlite", "file:payment_config_service?mode=memory&cache=shared")
+	dbName := fmt.Sprintf(
+		"file:%s?mode=memory&cache=shared",
+		strings.NewReplacer("/", "_", " ", "_").Replace(t.Name()),
+	)
+	db, err := sql.Open("sqlite", dbName)
 	if err != nil {
 		t.Fatalf("open sqlite: %v", err)
 	}

backend/internal/service/payment_order.go

@@ -326,20 +326,17 @@ func requestNeedsWeChatJSAPICompatibility(req CreateOrderRequest) bool {
 }
 
 func (s *PaymentService) usesOfficialWxpayVisibleMethod(ctx context.Context) bool {
-	if s == nil || s.configService == nil || s.configService.settingRepo == nil {
+	if s == nil || s.configService == nil {
 		return false
 	}
-	vals, err := s.configService.settingRepo.GetMultiple(ctx, []string{
-		SettingPaymentVisibleMethodWxpayEnabled,
-		SettingPaymentVisibleMethodWxpaySource,
-	})
+	inst, err := s.configService.resolveEnabledVisibleMethodInstance(ctx, payment.TypeWxpay)
 	if err != nil {
 		return false
 	}
-	if vals[SettingPaymentVisibleMethodWxpayEnabled] != "true" {
+	if inst == nil {
 		return false
 	}
-	return NormalizeVisibleMethodSource(payment.TypeWxpay, vals[SettingPaymentVisibleMethodWxpaySource]) == VisibleMethodSourceOfficialWechat
+	return inst.ProviderKey == payment.TypeWxpay
 }
 
 func (s *PaymentService) invokeProvider(ctx context.Context, order *dbent.PaymentOrder, req CreateOrderRequest, cfg *PaymentConfig, limitAmount float64, payAmountStr string, payAmount float64, plan *dbent.SubscriptionPlan, sel *payment.InstanceSelection) (*CreateOrderResponse, error) {

backend/internal/service/payment_order_jsapi_test.go

@@ -2,115 +2,32 @@ package service
 
 import (
 	"context"
-	"encoding/json"
-	"fmt"
 	"testing"
 
 	"github.com/Wei-Shaw/sub2api/internal/payment"
 )
 
-const jsapiTestEncryptionKey = "0123456789abcdef0123456789abcdef"
-
-func TestSelectCreateOrderInstancePrefersJSAPICompatibleWxpayInstance(t *testing.T) {
+func TestUsesOfficialWxpayVisibleMethodDerivesFromEnabledProviderInstance(t *testing.T) {
 	ctx := context.Background()
 	client := newPaymentConfigServiceTestClient(t)
 
-	compatibleConfig := mustEncryptJSAPITestConfig(t, map[string]string{
-		"appId":       "wx-merchant-app",
-		"mpAppId":     "wx-mp-app",
-		"mchId":       "mch-compatible",
-		"privateKey":  "private-key",
-		"apiV3Key":    jsapiTestEncryptionKey,
-		"publicKey":   "public-key",
-		"publicKeyId": "key-compatible",
-		"certSerial":  "serial-compatible",
-	})
-	incompatibleConfig := mustEncryptJSAPITestConfig(t, map[string]string{
-		"appId":       "wx-merchant-other",
-		"mpAppId":     "wx-mp-other",
-		"mchId":       "mch-incompatible",
-		"privateKey":  "private-key",
-		"apiV3Key":    jsapiTestEncryptionKey,
-		"publicKey":   "public-key",
-		"publicKeyId": "key-incompatible",
-		"certSerial":  "serial-incompatible",
-	})
-
-	compatible, err := client.PaymentProviderInstance.Create().
+	_, err := client.PaymentProviderInstance.Create().
 		SetProviderKey(payment.TypeWxpay).
-		SetName("wxpay-compatible").
-		SetConfig(compatibleConfig).
+		SetName("Official WeChat").
+		SetConfig("{}").
 		SetSupportedTypes("wxpay").
 		SetEnabled(true).
 		SetSortOrder(1).
 		Save(ctx)
 	if err != nil {
-		t.Fatalf("create compatible wxpay instance: %v", err)
-	}
-	_, err = client.PaymentProviderInstance.Create().
-		SetProviderKey(payment.TypeWxpay).
-		SetName("wxpay-incompatible").
-		SetConfig(incompatibleConfig).
-		SetSupportedTypes("wxpay").
-		SetEnabled(true).
-		SetSortOrder(2).
-		Save(ctx)
-	if err != nil {
-		t.Fatalf("create incompatible wxpay instance: %v", err)
+		t.Fatalf("create official wxpay instance: %v", err)
 	}
 
-	configService := &PaymentConfigService{
-		entClient: client,
-		settingRepo: &paymentConfigSettingRepoStub{values: map[string]string{
-			SettingPaymentVisibleMethodWxpayEnabled:    "true",
-			SettingPaymentVisibleMethodWxpaySource:     VisibleMethodSourceOfficialWechat,
-			SettingKeyWeChatConnectEnabled:             "true",
-			SettingKeyWeChatConnectAppID:               "wx-mp-app",
-			SettingKeyWeChatConnectAppSecret:           "wechat-secret",
-			SettingKeyWeChatConnectMode:                "mp",
-			SettingKeyWeChatConnectScopes:              "snsapi_base",
-			SettingKeyWeChatConnectRedirectURL:         "https://api.example.com/api/v1/auth/oauth/wechat/callback",
-			SettingKeyWeChatConnectFrontendRedirectURL: "/auth/wechat/callback",
-		}},
-		encryptionKey: []byte(jsapiTestEncryptionKey),
-	}
-	loadBalancer := newVisibleMethodLoadBalancer(
-		payment.NewDefaultLoadBalancer(client, []byte(jsapiTestEncryptionKey)),
-		configService,
-	)
 	svc := &PaymentService{
-		entClient:     client,
-		loadBalancer:  loadBalancer,
-		configService: configService,
+		configService: &PaymentConfigService{entClient: client},
 	}
 
-	sel, err := svc.selectCreateOrderInstance(ctx, CreateOrderRequest{
-		PaymentType:     payment.TypeWxpay,
-		OpenID:          "openid-123",
-		IsWeChatBrowser: true,
-	}, &PaymentConfig{LoadBalanceStrategy: string(payment.StrategyRoundRobin)}, 12.5)
-	if err != nil {
-		t.Fatalf("selectCreateOrderInstance returned error: %v", err)
-	}
-	if sel == nil {
-		t.Fatal("expected selected instance, got nil")
-	}
-	expectedInstanceID := fmt.Sprintf("%d", compatible.ID)
-	if sel.InstanceID != expectedInstanceID {
-		t.Fatalf("selected instance id = %q, want %q", sel.InstanceID, expectedInstanceID)
-	}
-}
-
-func mustEncryptJSAPITestConfig(t *testing.T, config map[string]string) string {
-	t.Helper()
-
-	data, err := json.Marshal(config)
-	if err != nil {
-		t.Fatalf("marshal config: %v", err)
-	}
-	encrypted, err := payment.Encrypt(string(data), []byte(jsapiTestEncryptionKey))
-	if err != nil {
-		t.Fatalf("encrypt config: %v", err)
+	if !svc.usesOfficialWxpayVisibleMethod(ctx) {
+		t.Fatal("expected official wxpay visible method to be detected from enabled provider instance")
 	}
-	return encrypted
 }

backend/internal/service/payment_resume_service.go

@@ -40,8 +40,8 @@ const (
 	paymentResumeNotConfiguredCode    = "PAYMENT_RESUME_NOT_CONFIGURED"
 	paymentResumeNotConfiguredMessage = "payment resume tokens require a configured signing key"
 
-	paymentResumeTokenTTL        = 24 * time.Hour
-	wechatPaymentResumeTokenTTL  = 15 * time.Minute
+	paymentResumeTokenTTL       = 24 * time.Hour
+	wechatPaymentResumeTokenTTL = 15 * time.Minute
 )
 
 type ResumeTokenClaims struct {
@@ -163,7 +163,7 @@ func VisibleMethodProviderKeyForSource(method, source string) (string, bool) {
 }
 
 func newVisibleMethodLoadBalancer(inner payment.LoadBalancer, configService *PaymentConfigService) payment.LoadBalancer {
-	if inner == nil || configService == nil || configService.settingRepo == nil {
+	if inner == nil || configService == nil || configService.entClient == nil {
 		return inner
 	}
 	return &visibleMethodLoadBalancer{inner: inner, configService: configService}
@@ -179,21 +179,14 @@ func (lb *visibleMethodLoadBalancer) SelectInstance(ctx context.Context, provide
 		return lb.inner.SelectInstance(ctx, providerKey, paymentType, strategy, orderAmount)
 	}
 
-	enabledKey := visibleMethodEnabledSettingKey(visibleMethod)
-	sourceKey := visibleMethodSourceSettingKey(visibleMethod)
-	vals, err := lb.configService.settingRepo.GetMultiple(ctx, []string{enabledKey, sourceKey})
+	inst, err := lb.configService.resolveEnabledVisibleMethodInstance(ctx, visibleMethod)
 	if err != nil {
-		return nil, fmt.Errorf("load visible method routing for %s: %w", visibleMethod, err)
-	}
-	if vals[enabledKey] != "true" {
-		return nil, fmt.Errorf("visible payment method %s is disabled", visibleMethod)
+		return nil, err
 	}
-
-	targetProviderKey, ok := VisibleMethodProviderKeyForSource(visibleMethod, vals[sourceKey])
-	if !ok {
-		return nil, fmt.Errorf("visible payment method %s has no valid source", visibleMethod)
+	if inst == nil {
+		return nil, fmt.Errorf("visible payment method %s has no enabled provider instance", visibleMethod)
 	}
-	return lb.inner.SelectInstance(ctx, targetProviderKey, paymentType, strategy, orderAmount)
+	return lb.inner.SelectInstance(ctx, inst.ProviderKey, paymentType, strategy, orderAmount)
 }
 
 func visibleMethodEnabledSettingKey(method string) string {

backend/internal/service/payment_resume_service_test.go

@@ -344,21 +344,30 @@ func TestVisibleMethodProviderKeyForSource(t *testing.T) {
 	}
 }
 
-func TestVisibleMethodLoadBalancerUsesConfiguredSource(t *testing.T) {
+func TestVisibleMethodLoadBalancerUsesEnabledProviderInstance(t *testing.T) {
 	t.Parallel()
 
+	ctx := context.Background()
+	client := newPaymentConfigServiceTestClient(t)
+	_, err := client.PaymentProviderInstance.Create().
+		SetProviderKey(payment.TypeAlipay).
+		SetName("Official Alipay").
+		SetConfig("{}").
+		SetSupportedTypes("alipay").
+		SetEnabled(true).
+		SetSortOrder(1).
+		Save(ctx)
+	if err != nil {
+		t.Fatalf("create alipay provider: %v", err)
+	}
+
 	inner := &captureLoadBalancer{}
 	configService := &PaymentConfigService{
-		settingRepo: &paymentSettingRepoStub{
-			values: map[string]string{
-				SettingPaymentVisibleMethodAlipayEnabled: "true",
-				SettingPaymentVisibleMethodAlipaySource:  VisibleMethodSourceOfficialAlipay,
-			},
-		},
+		entClient: client,
 	}
 	lb := newVisibleMethodLoadBalancer(inner, configService)
 
-	_, err := lb.SelectInstance(context.Background(), "", payment.TypeAlipay, payment.StrategyRoundRobin, 12.5)
+	_, err = lb.SelectInstance(ctx, "", payment.TypeAlipay, payment.StrategyRoundRobin, 12.5)
 	if err != nil {
 		t.Fatalf("SelectInstance returned error: %v", err)
 	}
@@ -367,46 +376,19 @@ func TestVisibleMethodLoadBalancerUsesConfiguredSource(t *testing.T) {
 	}
 }
 
-func TestVisibleMethodLoadBalancerRejectsDisabledVisibleMethod(t *testing.T) {
+func TestVisibleMethodLoadBalancerRejectsMissingEnabledVisibleMethodProvider(t *testing.T) {
 	t.Parallel()
 
 	inner := &captureLoadBalancer{}
 	configService := &PaymentConfigService{
-		settingRepo: &paymentSettingRepoStub{
-			values: map[string]string{
-				SettingPaymentVisibleMethodWxpayEnabled: "false",
-				SettingPaymentVisibleMethodWxpaySource:  VisibleMethodSourceOfficialWechat,
-			},
-		},
+		entClient: newPaymentConfigServiceTestClient(t),
 	}
 	lb := newVisibleMethodLoadBalancer(inner, configService)
 
 	if _, err := lb.SelectInstance(context.Background(), "", payment.TypeWxpay, payment.StrategyRoundRobin, 9.9); err == nil {
-		t.Fatal("SelectInstance should reject disabled visible method")
-	}
-}
-
-type paymentSettingRepoStub struct {
-	values map[string]string
-}
-
-func (s *paymentSettingRepoStub) Get(context.Context, string) (*Setting, error) { return nil, nil }
-func (s *paymentSettingRepoStub) GetValue(_ context.Context, key string) (string, error) {
-	return s.values[key], nil
-}
-func (s *paymentSettingRepoStub) Set(context.Context, string, string) error { return nil }
-func (s *paymentSettingRepoStub) GetMultiple(_ context.Context, keys []string) (map[string]string, error) {
-	out := make(map[string]string, len(keys))
-	for _, key := range keys {
-		out[key] = s.values[key]
+		t.Fatal("SelectInstance should reject when no enabled provider instance exists")
 	}
-	return out, nil
-}
-func (s *paymentSettingRepoStub) SetMultiple(context.Context, map[string]string) error { return nil }
-func (s *paymentSettingRepoStub) GetAll(context.Context) (map[string]string, error) {
-	return s.values, nil
 }
-func (s *paymentSettingRepoStub) Delete(context.Context, string) error { return nil }
 
 type captureLoadBalancer struct {
 	lastProviderKey string

backend/internal/service/payment_visible_method_instances.go

+package service
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	dbent "github.com/Wei-Shaw/sub2api/ent"
+	"github.com/Wei-Shaw/sub2api/ent/paymentproviderinstance"
+	"github.com/Wei-Shaw/sub2api/internal/payment"
+	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
+)
+
+func enabledVisibleMethodsForProvider(providerKey, supportedTypes string) []string {
+	methodSet := make(map[string]struct{}, 2)
+	addMethod := func(method string) {
+		method = NormalizeVisibleMethod(method)
+		switch method {
+		case payment.TypeAlipay, payment.TypeWxpay:
+			methodSet[method] = struct{}{}
+		}
+	}
+
+	switch strings.TrimSpace(providerKey) {
+	case payment.TypeAlipay:
+		if strings.TrimSpace(supportedTypes) == "" {
+			addMethod(payment.TypeAlipay)
+			break
+		}
+		for _, supportedType := range splitTypes(supportedTypes) {
+			if NormalizeVisibleMethod(supportedType) == payment.TypeAlipay {
+				addMethod(payment.TypeAlipay)
+				break
+			}
+		}
+	case payment.TypeWxpay:
+		if strings.TrimSpace(supportedTypes) == "" {
+			addMethod(payment.TypeWxpay)
+			break
+		}
+		for _, supportedType := range splitTypes(supportedTypes) {
+			if NormalizeVisibleMethod(supportedType) == payment.TypeWxpay {
+				addMethod(payment.TypeWxpay)
+				break
+			}
+		}
+	case payment.TypeEasyPay:
+		for _, supportedType := range splitTypes(supportedTypes) {
+			addMethod(supportedType)
+		}
+	}
+
+	methods := make([]string, 0, len(methodSet))
+	for _, method := range []string{payment.TypeAlipay, payment.TypeWxpay} {
+		if _, ok := methodSet[method]; ok {
+			methods = append(methods, method)
+		}
+	}
+	return methods
+}
+
+func providerSupportsVisibleMethod(inst *dbent.PaymentProviderInstance, method string) bool {
+	if inst == nil || !inst.Enabled {
+		return false
+	}
+	method = NormalizeVisibleMethod(method)
+	for _, candidate := range enabledVisibleMethodsForProvider(inst.ProviderKey, inst.SupportedTypes) {
+		if candidate == method {
+			return true
+		}
+	}
+	return false
+}
+
+func filterEnabledVisibleMethodInstances(instances []*dbent.PaymentProviderInstance, method string) []*dbent.PaymentProviderInstance {
+	filtered := make([]*dbent.PaymentProviderInstance, 0, len(instances))
+	for _, inst := range instances {
+		if providerSupportsVisibleMethod(inst, method) {
+			filtered = append(filtered, inst)
+		}
+	}
+	return filtered
+}
+
+func buildPaymentProviderConflictError(method string, conflicting *dbent.PaymentProviderInstance) error {
+	metadata := map[string]string{
+		"payment_method": NormalizeVisibleMethod(method),
+	}
+	if conflicting != nil {
+		metadata["conflicting_provider_id"] = fmt.Sprintf("%d", conflicting.ID)
+		metadata["conflicting_provider_key"] = conflicting.ProviderKey
+		metadata["conflicting_provider_name"] = conflicting.Name
+	}
+	return infraerrors.Conflict(
+		"PAYMENT_PROVIDER_CONFLICT",
+		fmt.Sprintf("%s payment already has an enabled provider instance", NormalizeVisibleMethod(method)),
+	).WithMetadata(metadata)
+}
+
+func (s *PaymentConfigService) validateVisibleMethodEnablementConflicts(
+	ctx context.Context,
+	excludeID int64,
+	providerKey string,
+	supportedTypes string,
+	enabled bool,
+) error {
+	if s == nil || s.entClient == nil || !enabled {
+		return nil
+	}
+
+	claimedMethods := enabledVisibleMethodsForProvider(providerKey, supportedTypes)
+	if len(claimedMethods) == 0 {
+		return nil
+	}
+
+	query := s.entClient.PaymentProviderInstance.Query().
+		Where(paymentproviderinstance.EnabledEQ(true))
+	if excludeID > 0 {
+		query = query.Where(paymentproviderinstance.IDNEQ(excludeID))
+	}
+	instances, err := query.All(ctx)
+	if err != nil {
+		return fmt.Errorf("query enabled payment providers: %w", err)
+	}
+
+	for _, method := range claimedMethods {
+		for _, inst := range instances {
+			if providerSupportsVisibleMethod(inst, method) {
+				return buildPaymentProviderConflictError(method, inst)
+			}
+		}
+	}
+	return nil
+}
+
+func (s *PaymentConfigService) resolveEnabledVisibleMethodInstance(
+	ctx context.Context,
+	method string,
+) (*dbent.PaymentProviderInstance, error) {
+	if s == nil || s.entClient == nil {
+		return nil, nil
+	}
+
+	method = NormalizeVisibleMethod(method)
+	if method != payment.TypeAlipay && method != payment.TypeWxpay {
+		return nil, nil
+	}
+
+	instances, err := s.entClient.PaymentProviderInstance.Query().
+		Where(paymentproviderinstance.EnabledEQ(true)).
+		Order(paymentproviderinstance.BySortOrder()).
+		All(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("query enabled payment providers: %w", err)
+	}
+
+	matching := filterEnabledVisibleMethodInstances(instances, method)
+	switch len(matching) {
+	case 0:
+		return nil, nil
+	case 1:
+		return matching[0], nil
+	default:
+		return nil, buildPaymentProviderConflictError(method, matching[0])
+	}
+}

frontend/src/i18n/locales/en.ts

@@ -4757,6 +4757,7 @@ export default {
         supportedTypesHint: 'Comma-separated, e.g. alipay,wxpay',
         refundEnabled: 'Allow Refund',
         allowUserRefund: 'Allow User Refund',
+        enableConflict: '{method} already has an enabled provider instance: {provider}. Disable the existing instance before switching.',
       },
       balanceNotify: {
         title: 'Balance Low Notification',
@@ -5612,6 +5613,7 @@ export default {
       alipayMobileUnavailable: 'This page could not hand off to Alipay.',
       alipayMobileOpenHint: 'Allow the current page to open the Alipay app, or retry from the system browser.',
       PENDING_ORDERS: 'This provider has pending orders. Please wait for them to complete before making changes.',
+      PAYMENT_PROVIDER_CONFLICT: 'Another enabled provider instance is already serving this payment method. Disable it before continuing.',
     },
     stripePay: 'Pay Now',
     stripeSuccessProcessing: 'Payment successful, processing your order...',

frontend/src/i18n/locales/zh.ts

@@ -4921,6 +4921,7 @@ export default {
         supportedTypesHint: '逗号分隔，如 alipay,wxpay',
         refundEnabled: '允许退款',
         allowUserRefund: '允许用户退款',
+        enableConflict: '{method} 已有启用中的服务商实例：{provider}。请先停用现有实例后再启用或切换。',
       },
       balanceNotify: {
         title: '余额不足提醒',
@@ -5800,6 +5801,7 @@ export default {
       alipayMobileUnavailable: '当前页面未成功跳转到支付宝。',
       alipayMobileOpenHint: '请允许当前页面打开支付宝 App，或改用系统浏览器重新发起支付。',
       PENDING_ORDERS: '该服务商有未完成的订单，请等待订单完成后再操作',
+      PAYMENT_PROVIDER_CONFLICT: '该支付方式已有其他启用中的服务商实例，请先停用后再继续。',
     },
     stripePay: '立即支付',
     stripeSuccessProcessing: '支付成功，正在处理订单...',

frontend/src/views/admin/SettingsView.vue

@@ -4160,73 +4160,6 @@
                     </a>
                   </p>
                 </div>
-                <div class="grid grid-cols-1 gap-3 lg:grid-cols-2">
-                  <div
-                    v-for="visibleMethod in paymentVisibleMethodCards"
-                    :key="visibleMethod.key"
-                    class="rounded-lg border border-gray-200 p-4 dark:border-dark-700"
-                  >
-                    <div class="flex items-center justify-between">
-                      <div>
-                        <label
-                          class="font-medium text-gray-900 dark:text-white"
-                        >
-                          {{
-                            t("admin.settings.paymentVisibleMethods.methodLabel", {
-                              title: visibleMethod.title,
-                            })
-                          }}
-                        </label>
-                        <p
-                          class="mt-1 text-sm text-gray-500 dark:text-gray-400"
-                        >
-                          {{
-                            t("admin.settings.paymentVisibleMethods.methodHint")
-                          }}
-                        </p>
-                      </div>
-                      <Toggle
-                        :model-value="
-                          getPaymentVisibleMethodEnabled(visibleMethod.key)
-                        "
-                        @update:model-value="
-                          setPaymentVisibleMethodEnabled(
-                            visibleMethod.key,
-                            $event,
-                          )
-                        "
-                      />
-                    </div>
-
-                    <div class="mt-4">
-                      <label class="input-label">
-                        {{ t("admin.settings.paymentVisibleMethods.sourceLabel") }}
-                      </label>
-                      <Select
-                        :model-value="
-                          getPaymentVisibleMethodSource(visibleMethod.key)
-                        "
-                        :options="
-                          getPaymentVisibleMethodSourceSelectOptions(
-                            visibleMethod.key,
-                          )
-                        "
-                        @update:model-value="
-                          setPaymentVisibleMethodSource(
-                            visibleMethod.key,
-                            $event,
-                          )
-                        "
-                        :placeholder="visibleMethod.key"
-                      />
-                      <p class="mt-1.5 text-xs text-gray-400">
-                        {{
-                          t("admin.settings.paymentVisibleMethods.sourceHint")
-                        }}
-                      </p>
-                    </div>
-                  </div>
-                </div>
                 <!-- Row 5: Help image + text -->
                 <div class="grid grid-cols-2 gap-3">
                   <div>
@@ -4742,15 +4675,12 @@ import {
   buildAuthSourceDefaultsState,
   defaultWeChatConnectScopesForMode,
   deriveWeChatConnectStoredMode,
-  getPaymentVisibleMethodSourceOptions,
-  normalizePaymentVisibleMethodSource,
   normalizeDefaultSubscriptionSettings,
   resolveWeChatConnectModeCapabilities,
 } from "@/api/admin/settings";
 import type {
   AuthSourceDefaultsState,
   AuthSourceType,
-  PaymentVisibleMethod,
   SystemSettings,
   UpdateSettingsRequest,
   DefaultSubscriptionSetting,
@@ -4777,6 +4707,7 @@ import { useClipboard } from "@/composables/useClipboard";
 import { extractApiErrorMessage } from "@/utils/apiError";
 import { useAppStore } from "@/stores";
 import { useAdminSettingsStore } from "@/stores/adminSettings";
+import { normalizeVisibleMethod } from "@/components/payment/paymentFlow";
 import {
   isRegistrationEmailSuffixDomainValid,
   normalizeRegistrationEmailSuffixDomain,
@@ -4788,10 +4719,6 @@ 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"
@@ -4908,10 +4835,6 @@ type SettingsForm = Omit<
   wechat_connect_mobile_enabled: boolean;
   oidc_connect_client_secret: string;
   force_email_on_third_party_signup: boolean;
-  payment_visible_method_alipay_source: string;
-  payment_visible_method_wxpay_source: string;
-  payment_visible_method_alipay_enabled: boolean;
-  payment_visible_method_wxpay_enabled: boolean;
   openai_advanced_scheduler_enabled: boolean;
 };
 
@@ -4957,10 +4880,6 @@ const form = reactive<SettingsForm>({
   payment_cancel_rate_limit_window: 1,
   payment_cancel_rate_limit_unit: "day",
   payment_cancel_rate_limit_window_mode: "rolling",
-  payment_visible_method_alipay_source: "",
-  payment_visible_method_wxpay_source: "",
-  payment_visible_method_alipay_enabled: false,
-  payment_visible_method_wxpay_enabled: false,
   table_default_page_size: tablePageSizeDefault,
   table_page_size_options: [10, 20, 50, 100],
   custom_menu_items: [] as Array<{
@@ -5099,86 +5018,6 @@ const authSourceDefaultsMeta = computed(() => [
   },
 ]);
 
-const paymentVisibleMethodCards = computed(() => [
-  {
-    key: "alipay" as const,
-    title: t("payment.methods.alipay"),
-    enabledField: "payment_visible_method_alipay_enabled" as const,
-    sourceField: "payment_visible_method_alipay_source" as const,
-  },
-  {
-    key: "wxpay" as const,
-    title: t("payment.methods.wxpay"),
-    enabledField: "payment_visible_method_wxpay_enabled" as const,
-    sourceField: "payment_visible_method_wxpay_source" as const,
-  },
-]);
-
-function getPaymentVisibleMethodEnabled(method: "alipay" | "wxpay"): boolean {
-  return method === "alipay"
-    ? form.payment_visible_method_alipay_enabled
-    : form.payment_visible_method_wxpay_enabled;
-}
-
-function setPaymentVisibleMethodEnabled(
-  method: "alipay" | "wxpay",
-  enabled: boolean,
-) {
-  if (method === "alipay") {
-    form.payment_visible_method_alipay_enabled = enabled;
-    return;
-  }
-  form.payment_visible_method_wxpay_enabled = enabled;
-}
-
-function getPaymentVisibleMethodSource(method: "alipay" | "wxpay"): string {
-  return method === "alipay"
-    ? form.payment_visible_method_alipay_source
-    : form.payment_visible_method_wxpay_source;
-}
-
-function getPaymentVisibleMethodSourceSelectOptions(
-  method: PaymentVisibleMethod,
-) {
-  return getPaymentVisibleMethodSourceOptions(method).map((option) => ({
-    value: option.value,
-    label: localText(option.labelZh, option.labelEn),
-  }));
-}
-
-function setPaymentVisibleMethodSource(
-  method: "alipay" | "wxpay",
-  source: string | number | boolean | null,
-) {
-  const normalized = normalizePaymentVisibleMethodSource(method, source);
-  if (method === "alipay") {
-    form.payment_visible_method_alipay_source = normalized;
-    return;
-  }
-  form.payment_visible_method_wxpay_source = normalized;
-}
-
-function validatePaymentVisibleMethodSelections(): boolean {
-  for (const visibleMethod of paymentVisibleMethodCards.value) {
-    if (!getPaymentVisibleMethodEnabled(visibleMethod.key)) {
-      continue;
-    }
-
-    if (getPaymentVisibleMethodSource(visibleMethod.key)) {
-      continue;
-    }
-
-    appStore.showError(
-      t("admin.settings.paymentVisibleMethods.sourceRequiredError", {
-        title: visibleMethod.title,
-      }),
-    );
-    return false;
-  }
-
-  return true;
-}
-
 // Proxies for web search emulation ProxySelector
 const webSearchProxies = ref<Proxy[]>([]);
 
@@ -5660,16 +5499,6 @@ async function loadSettings() {
     form.default_subscriptions = normalizeDefaultSubscriptionSettings(
       settings.default_subscriptions,
     );
-    form.payment_visible_method_alipay_source =
-      normalizePaymentVisibleMethodSource(
-        "alipay",
-        settings.payment_visible_method_alipay_source,
-      );
-    form.payment_visible_method_wxpay_source =
-      normalizePaymentVisibleMethodSource(
-        "wxpay",
-        settings.payment_visible_method_wxpay_source,
-      );
     registrationEmailSuffixWhitelistTags.value =
       normalizeRegistrationEmailSuffixDomains(
         settings.registration_email_suffix_whitelist,
@@ -5873,7 +5702,6 @@ async function saveSettings() {
       );
       return;
     }
-
     // Validate URL fields — novalidate disables browser-native checks, so we validate here
     const isValidHttpUrl = (url: string): boolean => {
       if (!url) return true;
@@ -6028,18 +5856,6 @@ async function saveSettings() {
       payment_cancel_rate_limit_unit: form.payment_cancel_rate_limit_unit,
       payment_cancel_rate_limit_window_mode:
         form.payment_cancel_rate_limit_window_mode,
-      payment_visible_method_alipay_source: normalizePaymentVisibleMethodSource(
-        "alipay",
-        form.payment_visible_method_alipay_source,
-      ),
-      payment_visible_method_wxpay_source: normalizePaymentVisibleMethodSource(
-        "wxpay",
-        form.payment_visible_method_wxpay_source,
-      ),
-      payment_visible_method_alipay_enabled:
-        form.payment_visible_method_alipay_enabled,
-      payment_visible_method_wxpay_enabled:
-        form.payment_visible_method_wxpay_enabled,
       openai_advanced_scheduler_enabled: form.openai_advanced_scheduler_enabled,
       // Balance & quota notification
       balance_low_notify_enabled: form.balance_low_notify_enabled,
@@ -6062,16 +5878,6 @@ async function saveSettings() {
       }
     }
     Object.assign(authSourceDefaults, buildAuthSourceDefaultsState(updated));
-    form.payment_visible_method_alipay_source =
-      normalizePaymentVisibleMethodSource(
-        "alipay",
-        updated.payment_visible_method_alipay_source,
-      );
-    form.payment_visible_method_wxpay_source =
-      normalizePaymentVisibleMethodSource(
-        "wxpay",
-        updated.payment_visible_method_wxpay_source,
-      );
     registrationEmailSuffixWhitelistTags.value =
       normalizeRegistrationEmailSuffixDomains(
         updated.registration_email_suffix_whitelist,
@@ -6588,8 +6394,98 @@ const cancelRateLimitModeOptions = computed(() => [
 
 const paymentErrorMap = computed(() => ({
   PENDING_ORDERS: t("payment.errors.PENDING_ORDERS"),
+  PAYMENT_PROVIDER_CONFLICT: t("payment.errors.PAYMENT_PROVIDER_CONFLICT"),
 }));
 
+type ProviderEnablementCandidate = Pick<
+  ProviderInstance,
+  "id" | "provider_key" | "supported_types" | "enabled" | "name"
+>;
+
+function getProviderVisibleMethods(
+  provider: ProviderEnablementCandidate,
+): Array<"alipay" | "wxpay"> {
+  if (!provider.enabled) {
+    return [];
+  }
+
+  const supportedTypes = Array.isArray(provider.supported_types)
+    ? provider.supported_types
+    : [];
+  const methods = new Set<"alipay" | "wxpay">();
+  const addMethod = (type: string) => {
+    const method = normalizeVisibleMethod(type);
+    if (method === "alipay" || method === "wxpay") {
+      methods.add(method);
+    }
+  };
+
+  if (provider.provider_key === "alipay") {
+    if (supportedTypes.length === 0) {
+      methods.add("alipay");
+    } else {
+      supportedTypes.forEach((type) => {
+        if (normalizeVisibleMethod(type) === "alipay") {
+          methods.add("alipay");
+        }
+      });
+    }
+  } else if (provider.provider_key === "wxpay") {
+    if (supportedTypes.length === 0) {
+      methods.add("wxpay");
+    } else {
+      supportedTypes.forEach((type) => {
+        if (normalizeVisibleMethod(type) === "wxpay") {
+          methods.add("wxpay");
+        }
+      });
+    }
+  } else if (provider.provider_key === "easypay") {
+    supportedTypes.forEach(addMethod);
+  }
+
+  return Array.from(methods);
+}
+
+function findProviderEnablementConflict(
+  candidate: ProviderEnablementCandidate,
+): { method: "alipay" | "wxpay"; conflicting: ProviderInstance } | null {
+  const claimedMethods = getProviderVisibleMethods(candidate);
+  if (claimedMethods.length === 0) {
+    return null;
+  }
+
+  for (const other of providers.value) {
+    if (other.id === candidate.id || !other.enabled) {
+      continue;
+    }
+
+    const otherMethods = getProviderVisibleMethods(other);
+    const matchedMethod = claimedMethods.find((method) =>
+      otherMethods.includes(method),
+    );
+    if (matchedMethod) {
+      return {
+        method: matchedMethod,
+        conflicting: other,
+      };
+    }
+  }
+
+  return null;
+}
+
+function showProviderEnablementConflict(
+  conflict: { method: "alipay" | "wxpay"; conflicting: ProviderInstance },
+) {
+  appStore.showError(
+    t("admin.settings.payment.enableConflict", {
+      method: t(`payment.methods.${conflict.method}`),
+      provider: conflict.conflicting.name,
+    }),
+  );
+}
+
 async function loadProviders() {
   providersLoading.value = true;
   try {
@@ -6619,6 +6515,21 @@ function openEditProvider(provider: ProviderInstance) {
 async function handleSaveProvider(payload: Partial<ProviderInstance>) {
   providerSaving.value = true;
   try {
+    const candidate: ProviderEnablementCandidate = {
+      id: editingProvider.value?.id ?? 0,
+      provider_key:
+        payload.provider_key ?? editingProvider.value?.provider_key ?? "",
+      supported_types:
+        payload.supported_types ?? editingProvider.value?.supported_types ?? [],
+      enabled: payload.enabled ?? editingProvider.value?.enabled ?? false,
+      name: payload.name ?? editingProvider.value?.name ?? "",
+    };
+    const conflict = findProviderEnablementConflict(candidate);
+    if (conflict) {
+      showProviderEnablementConflict(conflict);
+      return;
+    }
+
     if (editingProvider.value) {
       await adminAPI.payment.updateProvider(editingProvider.value.id, payload);
     } else {
@@ -6647,6 +6558,20 @@ async function handleToggleField(
   else if (field === "refund_enabled") newValue = !provider.refund_enabled;
   else newValue = !provider.allow_user_refund;
 
+  if (field === "enabled" && newValue) {
+    const conflict = findProviderEnablementConflict({
+      id: provider.id,
+      provider_key: provider.provider_key,
+      supported_types: provider.supported_types,
+      enabled: true,
+      name: provider.name,
+    });
+    if (conflict) {
+      showProviderEnablementConflict(conflict);
+      return;
+    }
+  }
+
   const payload: Record<string, boolean> = { [field]: newValue };
   // Cascade: turning off refund_enabled also turns off allow_user_refund
   if (field === "refund_enabled" && !newValue) {
@@ -6654,13 +6579,7 @@ async function handleToggleField(
   }
   try {
     await adminAPI.payment.updateProvider(provider.id, payload);
-    if (field === "enabled") provider.enabled = newValue;
-    else if (field === "refund_enabled") {
-      provider.refund_enabled = newValue;
-      if (!newValue) provider.allow_user_refund = false;
-    } else {
-      provider.allow_user_refund = newValue;
-    }
+    await loadProviders();
   } catch (err: unknown) {
     appStore.showError(
       extractApiErrorMessage(err, t("common.error"), paymentErrorMap.value),
@@ -6672,11 +6591,22 @@ async function handleToggleType(provider: ProviderInstance, type: string) {
   const updated = provider.supported_types.includes(type)
     ? provider.supported_types.filter((t) => t !== type)
     : [...provider.supported_types, type];
+  const conflict = findProviderEnablementConflict({
+    id: provider.id,
+    provider_key: provider.provider_key,
+    supported_types: updated,
+    enabled: provider.enabled,
+    name: provider.name,
+  });
+  if (conflict) {
+    showProviderEnablementConflict(conflict);
+    return;
+  }
   try {
     await adminAPI.payment.updateProvider(provider.id, {
       supported_types: updated,
     } as any);
-    provider.supported_types = updated;
+    await loadProviders();
   } catch (err: unknown) {
     appStore.showError(
       extractApiErrorMessage(err, t("common.error"), paymentErrorMap.value),
@@ -6700,11 +6630,7 @@ async function handleReorderProviders(
         } as Partial<ProviderInstance>),
       ),
     );
-    // Update local state to match new order
-    for (const u of updates) {
-      const p = providers.value.find((p) => p.id === u.id);
-      if (p) p.sort_order = u.sort_order;
-    }
+    await loadProviders();
   } catch (err: unknown) {
     appStore.showError(extractApiErrorMessage(err, t("common.error")));
     loadProviders();

frontend/src/views/admin/__tests__/SettingsView.spec.ts

@@ -17,6 +17,9 @@ const {
   getGroups,
   listProxies,
   getProviders,
+  updateProvider,
+  createProvider,
+  deleteProvider,
   fetchPublicSettings,
   adminSettingsFetch,
   showError,
@@ -34,6 +37,9 @@ const {
   getGroups: vi.fn(),
   listProxies: vi.fn(),
   getProviders: vi.fn(),
+  updateProvider: vi.fn(),
+  createProvider: vi.fn(),
+  deleteProvider: vi.fn(),
   fetchPublicSettings: vi.fn(),
   adminSettingsFetch: vi.fn(),
   showError: vi.fn(),
@@ -61,6 +67,9 @@ vi.mock("@/api", () => ({
     },
     payment: {
       getProviders,
+      updateProvider,
+      createProvider,
+      deleteProvider,
     },
   },
 }));
@@ -413,6 +422,9 @@ describe("admin SettingsView payment visible method controls", () => {
     getGroups.mockReset();
     listProxies.mockReset();
     getProviders.mockReset();
+    updateProvider.mockReset();
+    createProvider.mockReset();
+    deleteProvider.mockReset();
     fetchPublicSettings.mockReset();
     adminSettingsFetch.mockReset();
     showError.mockReset();
@@ -467,98 +479,93 @@ describe("admin SettingsView payment visible method controls", () => {
     adminSettingsFetch.mockResolvedValue(undefined);
   });
 
-  it("loads canonical source options and normalizes existing values", async () => {
+  it("does not render legacy visible payment method controls", async () => {
     const wrapper = mountView();
 
     await flushPromises();
     await openPaymentTab(wrapper);
 
-    const paymentSourceSelects = wrapper
-      .findAll("select.select-stub")
-      .filter((node) =>
-        ["alipay", "wxpay"].includes(node.attributes("data-placeholder")),
-      );
-
-    expect(paymentSourceSelects).toHaveLength(2);
-
-    const alipaySelect = paymentSourceSelects.find(
-      (node) => node.attributes("data-placeholder") === "alipay",
-    );
-    const wxpaySelect = paymentSourceSelects.find(
-      (node) => node.attributes("data-placeholder") === "wxpay",
-    );
-
-    expect(alipaySelect?.element.value).toBe("official_alipay");
-    expect(
-      alipaySelect?.findAll("option").map((option) => option.element.value),
-    ).toEqual(["", "official_alipay", "easypay_alipay"]);
-
-    expect(wxpaySelect?.element.value).toBe("");
-    expect(
-      wxpaySelect?.findAll("option").map((option) => option.element.value),
-    ).toEqual(["", "official_wxpay", "easypay_wxpay"]);
+    expect(wrapper.text()).not.toContain("可见方式");
+    expect(wrapper.text()).not.toContain("支付来源");
   });
 
-  it("saves canonical source keys selected from the dropdowns", async () => {
+  it("does not submit legacy visible payment method settings", async () => {
     const wrapper = mountView();
 
     await flushPromises();
     await openPaymentTab(wrapper);
-
-    const paymentSourceSelects = wrapper
-      .findAll("select.select-stub")
-      .filter((node) =>
-        ["alipay", "wxpay"].includes(node.attributes("data-placeholder")),
-      );
-
-    const alipaySelect = paymentSourceSelects.find(
-      (node) => node.attributes("data-placeholder") === "alipay",
-    );
-    const wxpaySelect = paymentSourceSelects.find(
-      (node) => node.attributes("data-placeholder") === "wxpay",
-    );
-
-    await alipaySelect?.setValue("easypay_alipay");
-    await wxpaySelect?.setValue("official_wxpay");
     await wrapper.find("form").trigger("submit.prevent");
     await flushPromises();
 
     expect(updateSettings).toHaveBeenCalledTimes(1);
-    expect(updateSettings).toHaveBeenCalledWith(
-      expect.objectContaining({
-        payment_visible_method_alipay_source: "easypay_alipay",
-        payment_visible_method_wxpay_source: "official_wxpay",
-        payment_visible_method_alipay_enabled: true,
-        payment_visible_method_wxpay_enabled: true,
-      }),
-    );
+    const payload = updateSettings.mock.calls[0]?.[0];
+    expect(payload).not.toHaveProperty("payment_visible_method_alipay_source");
+    expect(payload).not.toHaveProperty("payment_visible_method_wxpay_source");
+    expect(payload).not.toHaveProperty("payment_visible_method_alipay_enabled");
+    expect(payload).not.toHaveProperty("payment_visible_method_wxpay_enabled");
   });
 
-  it("blocks saving when a visible payment method is enabled without a source", async () => {
-    const wrapper = mountView();
+  it("updates provider enablement immediately and reloads providers", async () => {
+    const provider = {
+      id: 7,
+      provider_key: "alipay",
+      name: "Official Alipay",
+      config: {},
+      supported_types: ["alipay"],
+      enabled: false,
+      payment_mode: "",
+      refund_enabled: false,
+      allow_user_refund: false,
+      limits: "",
+      sort_order: 0,
+    };
+    getProviders.mockReset();
+    getProviders
+      .mockResolvedValueOnce({ data: [provider] })
+      .mockResolvedValueOnce({ data: [{ ...provider, enabled: true }] });
+    updateProvider.mockResolvedValue({ data: { ...provider, enabled: true } });
+
+    const PaymentProviderListStub = defineComponent({
+      emits: ["toggleField"],
+      setup(_, { emit }) {
+        return () =>
+          h(
+            "button",
+            {
+              class: "provider-toggle-stub",
+              onClick: () => emit("toggleField", provider, "enabled"),
+            },
+            "toggle provider",
+          );
+      },
+    });
+
+    const wrapper = mount(SettingsView, {
+      global: {
+        stubs: {
+          AppLayout: AppLayoutStub,
+          Select: SelectStub,
+          Toggle: ToggleStub,
+          Icon: true,
+          ConfirmDialog: true,
+          PaymentProviderList: PaymentProviderListStub,
+          PaymentProviderDialog: true,
+          GroupBadge: true,
+          GroupOptionItem: true,
+          ProxySelector: true,
+          ImageUpload: true,
+          BackupSettings: true,
+        },
+      },
+    });
 
     await flushPromises();
     await openPaymentTab(wrapper);
-
-    const paymentSourceSelects = wrapper
-      .findAll("select.select-stub")
-      .filter((node) =>
-        ["alipay", "wxpay"].includes(node.attributes("data-placeholder")),
-      );
-
-    const alipaySelect = paymentSourceSelects.find(
-      (node) => node.attributes("data-placeholder") === "alipay",
-    );
-
-    await alipaySelect?.setValue("");
-    await wrapper.find("form").trigger("submit.prevent");
+    await wrapper.get(".provider-toggle-stub").trigger("click");
     await flushPromises();
 
-    expect(updateSettings).not.toHaveBeenCalled();
-    expect(showError).toHaveBeenCalled();
-    expect(String(showError.mock.calls.at(-1)?.[0] ?? "")).toContain(
-      "支付来源",
-    );
+    expect(updateProvider).toHaveBeenCalledWith(7, { enabled: true });
+    expect(getProviders).toHaveBeenCalledTimes(2);
   });
 
   it("renders advanced scheduler copy as local experimental gateway policy", async () => {
@@ -588,6 +595,9 @@ describe("admin SettingsView wechat connect controls", () => {
     getGroups.mockReset();
     listProxies.mockReset();
     getProviders.mockReset();
+    updateProvider.mockReset();
+    createProvider.mockReset();
+    deleteProvider.mockReset();
     fetchPublicSettings.mockReset();
     adminSettingsFetch.mockReset();
     showError.mockReset();