fix(payment): respect configured visible method source

backend/internal/service/payment_order_jsapi_test.go

@@ -31,3 +31,68 @@ func TestUsesOfficialWxpayVisibleMethodDerivesFromEnabledProviderInstance(t *tes
 		t.Fatal("expected official wxpay visible method to be detected from enabled provider instance")
 	}
 }
+
+func TestUsesOfficialWxpayVisibleMethodRespectsConfiguredSourceWhenMultipleProvidersEnabled(t *testing.T) {
+	tests := []struct {
+		name         string
+		source       string
+		wantOfficial bool
+	}{
+		{
+			name:         "official source selected",
+			source:       VisibleMethodSourceOfficialWechat,
+			wantOfficial: true,
+		},
+		{
+			name:         "easypay source selected",
+			source:       VisibleMethodSourceEasyPayWechat,
+			wantOfficial: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			ctx := context.Background()
+			client := newPaymentConfigServiceTestClient(t)
+
+			_, err := client.PaymentProviderInstance.Create().
+				SetProviderKey(payment.TypeWxpay).
+				SetName("Official WeChat").
+				SetConfig("{}").
+				SetSupportedTypes("wxpay").
+				SetEnabled(true).
+				SetSortOrder(1).
+				Save(ctx)
+			if err != nil {
+				t.Fatalf("create official wxpay instance: %v", err)
+			}
+
+			_, err = client.PaymentProviderInstance.Create().
+				SetProviderKey(payment.TypeEasyPay).
+				SetName("EasyPay WeChat").
+				SetConfig("{}").
+				SetSupportedTypes("wxpay").
+				SetEnabled(true).
+				SetSortOrder(2).
+				Save(ctx)
+			if err != nil {
+				t.Fatalf("create easypay wxpay instance: %v", err)
+			}
+
+			svc := &PaymentService{
+				configService: &PaymentConfigService{
+					entClient: client,
+					settingRepo: &paymentConfigSettingRepoStub{
+						values: map[string]string{
+							SettingPaymentVisibleMethodWxpaySource: tt.source,
+						},
+					},
+				},
+			}
+
+			if got := svc.usesOfficialWxpayVisibleMethod(ctx); got != tt.wantOfficial {
+				t.Fatalf("usesOfficialWxpayVisibleMethod() = %v, want %v", got, tt.wantOfficial)
+			}
+		})
+	}
+}