fix payment visible methods and resume recovery

backend/internal/payment/provider/wxpay.go

@@ -310,12 +310,14 @@ func buildWxpayResultURL(returnURL string, req payment.CreatePaymentRequest) (st
 		return "", fmt.Errorf("return URL must be an absolute http(s) URL")
 	}
 
-	values := url.Values{}
+	values := u.Query()
 	values.Set("out_trade_no", strings.TrimSpace(req.OrderID))
 	if paymentType := strings.TrimSpace(req.PaymentType); paymentType != "" {
 		values.Set("payment_type", paymentType)
 	}
-	u.Path = wxpayResultPath
+	if strings.TrimSpace(u.Path) == "" {
+		u.Path = wxpayResultPath
+	}
 	u.RawPath = ""
 	u.RawQuery = values.Encode()
 	u.Fragment = ""

backend/internal/payment/provider/wxpay_test.go

@@ -4,6 +4,7 @@ package provider
 
 import (
 	"context"
+	"net/url"
 	"strings"
 	"testing"
 
@@ -263,6 +264,36 @@ func TestNewWxpay(t *testing.T) {
 	}
 }
 
+func TestBuildWxpayResultURLPreservesResumeToken(t *testing.T) {
+	t.Parallel()
+
+	resultURL, err := buildWxpayResultURL("https://app.example.com/payment/result?order_id=42&resume_token=resume-42&status=success", payment.CreatePaymentRequest{
+		OrderID:     "sub2_42",
+		PaymentType: payment.TypeWxpay,
+	})
+	if err != nil {
+		t.Fatalf("buildWxpayResultURL returned error: %v", err)
+	}
+
+	parsed, err := url.Parse(resultURL)
+	if err != nil {
+		t.Fatalf("url.Parse returned error: %v", err)
+	}
+	query := parsed.Query()
+	if parsed.Path != wxpayResultPath {
+		t.Fatalf("path = %q, want %q", parsed.Path, wxpayResultPath)
+	}
+	if query.Get("resume_token") != "resume-42" {
+		t.Fatalf("resume_token = %q, want %q", query.Get("resume_token"), "resume-42")
+	}
+	if query.Get("order_id") != "42" {
+		t.Fatalf("order_id = %q, want %q", query.Get("order_id"), "42")
+	}
+	if query.Get("out_trade_no") != "sub2_42" {
+		t.Fatalf("out_trade_no = %q, want %q", query.Get("out_trade_no"), "sub2_42")
+	}
+}
+
 func TestResolveWxpayJSAPIAppID(t *testing.T) {
 	t.Parallel()
 

backend/internal/service/payment_config_limits.go

@@ -20,6 +20,18 @@ 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))
+	}
 	resp := &MethodLimitsResponse{
 		Methods: make(map[string]MethodLimits, len(typeInstances)),
 	}
@@ -31,6 +43,40 @@ func (s *PaymentConfigService) GetAvailableMethodLimits(ctx context.Context) (*M
 	return resp, nil
 }
 
+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_limits_test.go

@@ -1,6 +1,7 @@
 package service
 
 import (
+	"context"
 	"testing"
 
 	dbent "github.com/Wei-Shaw/sub2api/ent"
@@ -299,3 +300,73 @@ func TestPcInstanceTypeLimits(t *testing.T) {
 		}
 	})
 }
+
+func TestGetAvailableMethodLimitsRespectsVisibleMethodRouting(t *testing.T) {
+	ctx := context.Background()
+	client := newPaymentConfigServiceTestClient(t)
+
+	_, err := client.PaymentProviderInstance.Create().
+		SetProviderKey(payment.TypeAlipay).
+		SetName("Official Alipay").
+		SetConfig("{}").
+		SetSupportedTypes("alipay").
+		SetLimits(`{"alipay":{"singleMin":10,"singleMax":100}}`).
+		SetEnabled(true).
+		Save(ctx)
+	if err != nil {
+		t.Fatalf("create official alipay instance: %v", err)
+	}
+	_, err = client.PaymentProviderInstance.Create().
+		SetProviderKey(payment.TypeEasyPay).
+		SetName("EasyPay Alipay").
+		SetConfig("{}").
+		SetSupportedTypes("alipay").
+		SetLimits(`{"alipay":{"singleMin":20,"singleMax":200}}`).
+		SetEnabled(true).
+		Save(ctx)
+	if err != nil {
+		t.Fatalf("create easypay alipay instance: %v", err)
+	}
+	_, err = client.PaymentProviderInstance.Create().
+		SetProviderKey(payment.TypeWxpay).
+		SetName("Official WeChat").
+		SetConfig("{}").
+		SetSupportedTypes("wxpay").
+		SetLimits(`{"wxpay":{"singleMin":30,"singleMax":300}}`).
+		SetEnabled(true).
+		Save(ctx)
+	if err != nil {
+		t.Fatalf("create official wxpay instance: %v", err)
+	}
+
+	svc := &PaymentConfigService{
+		entClient: client,
+		settingRepo: &paymentConfigSettingRepoStub{
+			values: map[string]string{
+				SettingPaymentVisibleMethodAlipayEnabled: "true",
+				SettingPaymentVisibleMethodAlipaySource:  VisibleMethodSourceEasyPayAlipay,
+				SettingPaymentVisibleMethodWxpayEnabled:  "false",
+				SettingPaymentVisibleMethodWxpaySource:   VisibleMethodSourceOfficialWechat,
+			},
+		},
+	}
+
+	resp, err := svc.GetAvailableMethodLimits(ctx)
+	if err != nil {
+		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 alipayLimits.SingleMin != 20 || alipayLimits.SingleMax != 200 {
+		t.Fatalf("alipay limits = %+v, want easypay-only min=20 max=200", alipayLimits)
+	}
+	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 resp.GlobalMin != 20 || resp.GlobalMax != 200 {
+		t.Fatalf("global range = (%v, %v), want (20, 200)", resp.GlobalMin, resp.GlobalMax)
+	}
+}