feat(epay): support type selectors and preserve callback type

Add Aptos USDT/USDC payment support and drive token RPC routing

src/controller/admin/settings_controller.go

@@ -26,9 +26,9 @@ import (
 //     rate.okx_c2c_enabled   (bool)   — use OKX C2C rate feed
 //
 //   - group=epay:
-//     epay.default_token     (string) — default token for EPAY submit.php, e.g. "usdt"; empty allows status=4 placeholders when request token/network are also absent
+//     epay.default_token     (string) — default token for EPAY submit.php, e.g. "usdt"; ignored when a supported type=token.network selector is supplied; empty allows status=4 placeholders when request token/network are also absent
-//     epay.default_currency  (string) — default fiat currency for EPAY submit.php, e.g. "cny"; empty falls back to cny
+//     epay.default_currency  (string) — default fiat currency for EPAY submit.php, e.g. "cny"; still applies when a supported type selector is supplied; empty falls back to cny
-//     epay.default_network   (string) — default network for EPAY submit.php, e.g. "tron" or "ton"; empty allows status=4 placeholders when request token/network are also absent
+//     epay.default_network   (string) — default network for EPAY submit.php, e.g. "tron" or "ton"; ignored when a supported type=token.network selector is supplied; empty allows status=4 placeholders when request token/network are also absent
 //
 //   - group=okpay:
 //     okpay.enabled          (bool)   — enable OkPay as a switch-network payment option
@@ -95,7 +95,7 @@ func (c *BaseAdminController) ListSettings(ctx echo.Context) error {
 // @Summary      Upsert settings
 // @Description  Batch insert/update settings. Returns per-key status; failed items include error_code for frontend i18n.
 // @Description  Supported groups: brand, rate, system, epay, okpay.
-// @Description  epay group keys: epay.default_token (e.g. "usdt" or "ton", empty allows status=4 placeholders), epay.default_currency (e.g. "cny", empty falls back to cny), epay.default_network (e.g. "tron" or "ton", empty allows status=4 placeholders).
+// @Description  epay group keys: epay.default_token (e.g. "usdt" or "ton", ignored when a supported type=token.network selector is supplied, empty allows status=4 placeholders), epay.default_currency (e.g. "cny", still applies when a supported type selector is supplied, empty falls back to cny), epay.default_network (e.g. "tron" or "ton", ignored when a supported type=token.network selector is supplied, empty allows status=4 placeholders).
 // @Description  okpay group keys: okpay.enabled, okpay.shop_id, okpay.shop_token, okpay.api_url, okpay.callback_url, okpay.return_url, okpay.timeout_seconds, okpay.allow_tokens.
 // @Description  rate group keys: rate.forced_rate_list (JSON map, e.g. {"cny":{"usdt":0.14635,"ton":0.5}}; base/coin keys are normalized to lowercase), rate.api_url, rate.adjust_percent, rate.okx_c2c_enabled.
 // @Description  brand group keys: brand.checkout_name, brand.logo_url, brand.site_title, brand.success_copy, brand.support_url, brand.background_color, brand.background_image_url. Legacy aliases brand.site_name, brand.page_title and brand.pay_success_text are also supported.

src/controller/comm/order_controller.go

@@ -3,6 +3,7 @@ package comm
 import (
 	"encoding/json"
 	"net/http"
+	"strings"
 
 	"github.com/GMWalletApp/epusdt/middleware"
 	"github.com/GMWalletApp/epusdt/model/mdb"
@@ -13,6 +14,8 @@ import (
 	"github.com/labstack/echo/v4"
 )
 
+const EPayTypeContextKey = "epay_type"
+
 // apiKeyFromContext returns the api_keys row stamped by CheckApiSign.
 // Returns nil when the middleware didn't run (should not happen on authed routes).
 func apiKeyFromContext(ctx echo.Context) *mdb.ApiKey {
@@ -101,7 +104,10 @@ func (c *BaseCommController) SwitchNetwork(ctx echo.Context) (err error) {
 // POST (form) per the legacy EPAY protocol; swagger documents POST as
 // the canonical form — the GET variant is identical save the transport.
 // @Summary      Create transaction and redirect (EPAY compat)
-// @Description  Legacy EPAY-style endpoint. Accepts GET (querystring) and POST (form). On success, 302 redirects to /pay/checkout-counter/{trade_id}. Signature uses MD5 of sorted params + secret_key of the api_keys row matching the submitted pid. Optional request token/network/currency override database defaults and must be included in the EPay signature when sent. The server injects internal payment_type=Epay after EPay signature verification; merchants do not send GMPay payment_type to this endpoint.
+// @Description  Legacy EPAY-style endpoint. Accepts GET (querystring) and POST (form). On success, 302 redirects to /pay/checkout-counter/{trade_id}. Signature uses MD5 of sorted params + secret_key of the api_keys row matching the submitted pid.
+// @Description  After signature verification, token/network resolution is: supported type=token.network selector (for example usdt.tron) first; otherwise request token/network; otherwise epay.default_token / epay.default_network. If token and network are still both empty, the order is created as status=4 placeholder. Supplying only one of token/network remains invalid.
+// @Description  Currency resolution is unchanged: request currency -> epay.default_currency -> cny. Supported type selectors bypass only token/network defaults, not currency fallback.
+// @Description  Success return/notify currently use the stored request type when present, and fall back to alipay only when type was missing. The server injects internal payment_type=Epay after EPay signature verification; merchants do not send GMPay payment_type to this endpoint.
 // @Tags         Payment
 // @Accept       x-www-form-urlencoded
 // @Produce      html
@@ -111,7 +117,7 @@ func (c *BaseCommController) SwitchNetwork(ctx echo.Context) (err error) {
 // @Param        notify_url query string false "Callback URL (GET query)"
 // @Param        return_url query string false "Redirect URL after payment (GET query)"
 // @Param        name query string false "Order name (GET query)"
-// @Param        type query string false "Payment type (e.g. alipay, GET query)"
+// @Param        type query string false "Opaque merchant type or supported token.network selector such as alipay or usdt.tron (GET query)"
 // @Param        sign query string false "MD5 signature (GET query)"
 // @Param        sign_type query string false "Signature type (MD5, GET query)"
 // @Param        pid formData integer true "API key PID"
@@ -120,7 +126,7 @@ func (c *BaseCommController) SwitchNetwork(ctx echo.Context) (err error) {
 // @Param        notify_url formData string true "Callback URL"
 // @Param        return_url formData string false "Redirect URL after payment"
 // @Param        name formData string false "Order name"
-// @Param        type formData string false "Payment type (e.g. alipay)"
+// @Param        type formData string false "Opaque merchant type or supported token.network selector such as alipay or usdt.tron"
 // @Param        sign formData string true "MD5 signature"
 // @Param        sign_type formData string false "Signature type (MD5)"
 // @Success      302 "Redirect to checkout counter"
@@ -133,6 +139,9 @@ func (c *BaseCommController) CreateTransactionAndRedirect(ctx echo.Context) (err
 		log.Sugar.Errorf("bind request error: %v", err)
 		return c.FailJson(ctx, constant.ParamsMarshalErr)
 	}
+	if raw, ok := ctx.Get(EPayTypeContextKey).(string); ok {
+		req.EpayType = strings.TrimSpace(raw)
+	}
 	if err = c.ValidateStruct(ctx, req); err != nil {
 		log.Sugar.Errorf("validate request error: %v", err)
 		return c.FailJson(ctx, err)

src/controller/comm/pay_controller.go

@@ -14,7 +14,7 @@ import (
 // CheckoutCounter 收银台
 // @Summary      Checkout counter page
 // @Description  Return checkout initialization data when the order exists. This endpoint only confirms order existence and returns base order data; call /pay/check-status/{trade_id} for the current order status (1=waiting payment, 2=paid, 3=expired, 4=waiting token/network selection).
-// @Description  When status=4, actual_amount is 0 and token/network/receive_address are empty; this state is produced by GMPay placeholders or EPay submit.php when no token/network request values or database defaults exist. The cashier should guide the payer to choose an on-chain token/network or OkPay and then call /pay/switch-network.
+// @Description  When status=4, actual_amount is 0 and token/network/receive_address are empty; this state is produced by GMPay placeholders or EPay submit.php when no token/network request values or defaults resolve to a concrete payment asset. The cashier should guide the payer to choose an on-chain token/network or OkPay and then call /pay/switch-network.
 // @Description  For EPay orders with a merchant return_url, the response redirect_url is rewritten to the internal /pay/return/{trade_id} hop; the database still stores the merchant's raw return_url.
 // @Tags         Payment
 // @Produce      json
@@ -36,6 +36,7 @@ func (c *BaseCommController) CheckoutCounter(ctx echo.Context) (err error) {
 // Non-EPay or not-yet-paid orders are sent back to the checkout counter.
 // @Summary      Return to merchant (EPAY compat)
 // @Description  Browser-facing success return hop for EPay orders. Paid EPay orders are redirected to the merchant return_url with signed legacy EPay query params. Orders that are not EPay or not yet paid are redirected back to the checkout counter.
+// @Description  The signed query params currently use the stored request type when present; otherwise type=alipay is returned for compatibility.
 // @Description  This route also returns explicit business errors when the merchant return_url is missing, the order API key is unavailable, or EPay signature construction fails.
 // @Tags         Payment
 // @Produce      html

src/model/mdb/orders_mdb.go

@@ -51,6 +51,7 @@ type Orders struct {
 	NotifyUrl   string `gorm:"column:notify_url" json:"notify_url" example:"https://example.com/notify"`
 	RedirectUrl string `gorm:"column:redirect_url" json:"redirect_url" example:"https://example.com/success"`
 	Name        string `gorm:"column:name" json:"name" example:"VIP月卡"`
+	EpayType    string `gorm:"column:epay_type;size:64;default:''" json:"-"`
 	CallbackNum int    `gorm:"column:callback_num;default:0" json:"callback_num" example:"0"`
 	// 回调确认状态 1=回调成功 2=未回调/回调失败
 	CallBackConfirm int  `gorm:"column:callback_confirm;default:2" json:"callback_confirm" enums:"1,2" example:"2"`

src/model/request/order_request.go

@@ -18,6 +18,7 @@ type CreateTransactionRequest struct {
 	// empty or any other value is stored as "Gmpay" and uses GMPay JSON.
 	// It is optional for GMPay, but must be included in the signature when sent.
 	PaymentType string `json:"payment_type" form:"payment_type" example:"Epay"`
+	EpayType    string `json:"-" form:"-"`
 }
 
 func (r CreateTransactionRequest) Translates() map[string]string {

src/model/response/support_response.go

@@ -7,9 +7,9 @@ type NetworkTokenSupport struct {
 }
 
 type EpayPublicConfig struct {
-	DefaultToken    string `json:"default_token" example:""`       // EPay default token; empty means submit.php can create a status=4 placeholder when request token/network are also absent.
+	DefaultToken    string `json:"default_token" example:""`       // EPay default token; ignored when a supported type=token.network selector is supplied. Empty means submit.php can create a status=4 placeholder when request token/network are also absent.
-	DefaultCurrency string `json:"default_currency" example:"cny"` // EPay default fiat currency; falls back to cny when unset.
+	DefaultCurrency string `json:"default_currency" example:"cny"` // EPay default fiat currency; still applies when a supported type selector is supplied and falls back to cny when unset.
-	DefaultNetwork  string `json:"default_network" example:""`     // EPay default network; empty means submit.php can create a status=4 placeholder when request token/network are also absent.
+	DefaultNetwork  string `json:"default_network" example:""`     // EPay default network; ignored when a supported type=token.network selector is supplied. Empty means submit.php can create a status=4 placeholder when request token/network are also absent.
 }
 
 type SitePublicConfig struct {

src/model/service/epay_return.go

@@ -71,6 +71,16 @@ func ResolveOrderApiKey(order *mdb.Orders) (*mdb.ApiKey, error) {
 	return row, nil
 }
 
+func epayResultType(order *mdb.Orders) string {
+	if order == nil {
+		return "alipay"
+	}
+	if epayType := strings.TrimSpace(order.EpayType); epayType != "" {
+		return epayType
+	}
+	return "alipay"
+}
+
 func BuildEPayResultParams(order *mdb.Orders, apiKeyRow *mdb.ApiKey) (map[string]string, error) {
 	if order == nil || apiKeyRow == nil {
 		return nil, constant.EPayReturnSignatureErr
@@ -85,7 +95,7 @@ func BuildEPayResultParams(order *mdb.Orders, apiKeyRow *mdb.ApiKey) (map[string
 		PID:         pidInt,
 		TradeNo:     order.TradeId,
 		OutTradeNo:  order.OrderId,
-		Type:        "alipay",
+		Type:        epayResultType(order),
 		Name:        order.Name,
 		Money:       fmt.Sprintf("%.4f", order.Amount),
 		TradeStatus: "TRADE_SUCCESS",

src/model/service/epay_return_test.go

@@ -40,12 +40,13 @@ func TestBuildPublicRedirectURLRewritesOnlyEpayOrders(t *testing.T) {
 	}
 }
 
-func TestBuildEPayResultParamsMatchesLegacyFields(t *testing.T) {
+func TestBuildEPayResultParamsUsesOriginalType(t *testing.T) {
 	params, err := BuildEPayResultParams(&mdb.Orders{
 		TradeId:  "trade_epay_params",
 		OrderId:  "order_epay_params",
 		Name:     "VIP",
 		Amount:   1,
+		EpayType: "usdt.tron",
 	}, &mdb.ApiKey{
 		Pid:       "1001",
 		SecretKey: "epay-secret",
@@ -58,7 +59,7 @@ func TestBuildEPayResultParamsMatchesLegacyFields(t *testing.T) {
 		"pid":          "1001",
 		"trade_no":     "trade_epay_params",
 		"out_trade_no": "order_epay_params",
-		"type":         "alipay",
+		"type":         "usdt.tron",
 		"name":         "VIP",
 		"money":        "1.0000",
 		"trade_status": "TRADE_SUCCESS",
@@ -88,6 +89,24 @@ func TestBuildEPayResultParamsMatchesLegacyFields(t *testing.T) {
 	}
 }
 
+func TestBuildEPayResultParamsFallsBackToAlipayWhenTypeMissing(t *testing.T) {
+	params, err := BuildEPayResultParams(&mdb.Orders{
+		TradeId: "trade_epay_fallback",
+		OrderId: "order_epay_fallback",
+		Name:    "VIP",
+		Amount:  1,
+	}, &mdb.ApiKey{
+		Pid:       "1001",
+		SecretKey: "epay-secret",
+	})
+	if err != nil {
+		t.Fatalf("BuildEPayResultParams(): %v", err)
+	}
+	if got := params["type"]; got != "alipay" {
+		t.Fatalf("type = %q, want alipay", got)
+	}
+}
+
 func TestBuildEPayResultParamsRejectsNonNumericPid(t *testing.T) {
 	_, err := BuildEPayResultParams(&mdb.Orders{
 		TradeId: "trade_bad_pid",

src/model/service/order_service.go

@@ -116,6 +116,10 @@ func CreateTransaction(req *request.CreateTransactionRequest, apiKey *mdb.ApiKey
 	if strings.EqualFold(req.PaymentType, mdb.PaymentTypeEpay) {
 		paymentType = mdb.PaymentTypeEpay
 	}
+	epayType := ""
+	if paymentType == mdb.PaymentTypeEpay {
+		epayType = strings.TrimSpace(req.EpayType)
+	}
 
 	gCreateTransactionLock.Lock()
 	defer gCreateTransactionLock.Unlock()
@@ -146,6 +150,7 @@ func CreateTransaction(req *request.CreateTransactionRequest, apiKey *mdb.ApiKey
 			NotifyUrl:   notifyURL,
 			RedirectUrl: req.RedirectUrl,
 			Name:        req.Name,
+			EpayType:    epayType,
 			PaymentType: paymentType,
 			PayProvider: mdb.PaymentProviderOnChain,
 			ApiKeyID:    apiKeyID(apiKey),
@@ -205,6 +210,7 @@ func CreateTransaction(req *request.CreateTransactionRequest, apiKey *mdb.ApiKey
 		NotifyUrl:      notifyURL,
 		RedirectUrl:    req.RedirectUrl,
 		Name:           req.Name,
+		EpayType:       epayType,
 		PaymentType:    paymentType,
 		PayProvider:    mdb.PaymentProviderOnChain,
 		ApiKeyID:       apiKeyID(apiKey),
@@ -637,6 +643,7 @@ func SwitchNetwork(req *request.SwitchNetworkRequest) (*response.CheckoutCounter
 		NotifyUrl:       "",
 		RedirectUrl:     parent.RedirectUrl,
 		Name:            parent.Name,
+		EpayType:        parent.EpayType,
 		CallBackConfirm: mdb.CallBackConfirmOk, // don't trigger callback on sub-order
 		PaymentType:     parent.PaymentType,
 		PayProvider:     mdb.PaymentProviderOnChain,
@@ -916,6 +923,7 @@ func switchToOkPay(parent *mdb.Orders, token string) (*response.CheckoutCounterR
 		NotifyUrl:       "",
 		RedirectUrl:     parent.RedirectUrl,
 		Name:            parent.Name,
+		EpayType:        parent.EpayType,
 		CallBackConfirm: mdb.CallBackConfirmOk,
 		PaymentType:     parent.PaymentType,
 		PayProvider:     mdb.PaymentProviderOkPay,

src/mq/worker_test.go

@@ -5,6 +5,7 @@ import (
 	"io"
 	"net/http"
 	"net/http/httptest"
+	"strconv"
 	"sync"
 	"sync/atomic"
 	"testing"
@@ -573,6 +574,7 @@ func TestSendOrderCallbackEpayUsesApiKeySecretByPid(t *testing.T) {
 		Status:             mdb.StatusPaySuccess,
 		NotifyUrl:          server.URL,
 		BlockTransactionId: "block_epay_sign",
+		EpayType:           "usdt.tron",
 		PaymentType:        "epay",
 		ApiKeyID:           key.ID,
 	}
@@ -587,8 +589,8 @@ func TestSendOrderCallbackEpayUsesApiKeySecretByPid(t *testing.T) {
 	if formPayload["sign_type"] != "MD5" {
 		t.Fatalf("sign_type = %q, want MD5", formPayload["sign_type"])
 	}
-	if formPayload["type"] != "alipay" {
+	if formPayload["type"] != "usdt.tron" {
-		t.Fatalf("type = %q, want alipay", formPayload["type"])
+		t.Fatalf("type = %q, want usdt.tron", formPayload["type"])
 	}
 	if formPayload["trade_status"] != "TRADE_SUCCESS" {
 		t.Fatalf("trade_status = %q, want TRADE_SUCCESS", formPayload["trade_status"])
@@ -629,6 +631,90 @@ func TestSendOrderCallbackEpayUsesApiKeySecretByPid(t *testing.T) {
 	}
 }
 
+func TestSendOrderCallbackEpayPreservesStoredTypeValues(t *testing.T) {
+	cleanup := testutil.SetupTestDatabases(t)
+	defer cleanup()
+
+	key := &mdb.ApiKey{
+		Name:      "epay-key-stored-type",
+		Pid:       "9201",
+		SecretKey: "epay-secret-9201",
+		Status:    mdb.ApiKeyStatusEnable,
+	}
+	if err := dao.Mdb.Create(key).Error; err != nil {
+		t.Fatalf("create epay api key: %v", err)
+	}
+
+	cases := []struct {
+		name     string
+		epayType string
+	}{
+		{name: "alipay", epayType: "alipay"},
+		{name: "non_selector", epayType: "usdt-tron"},
+		{name: "unsupported_selector", epayType: "usdc.tron"},
+	}
+
+	for idx, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			formPayload := map[string]string{}
+			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				if err := r.ParseForm(); err != nil {
+					http.Error(w, err.Error(), http.StatusBadRequest)
+					return
+				}
+				for k, v := range r.Form {
+					if len(v) > 0 {
+						formPayload[k] = v[0]
+					}
+				}
+				_, _ = io.WriteString(w, "ok")
+			}))
+			defer server.Close()
+
+			order := &mdb.Orders{
+				TradeId:            "trade_epay_type_case_" + strconv.Itoa(idx),
+				OrderId:            "order_epay_type_case_" + strconv.Itoa(idx),
+				Amount:             1,
+				Currency:           "CNY",
+				ActualAmount:       1,
+				ReceiveAddress:     "wallet_epay_type_case",
+				Token:              "USDT",
+				Name:               "VIP",
+				Status:             mdb.StatusPaySuccess,
+				NotifyUrl:          server.URL,
+				BlockTransactionId: "block_epay_type_case_" + strconv.Itoa(idx),
+				EpayType:           tc.epayType,
+				PaymentType:        "epay",
+				ApiKeyID:           key.ID,
+			}
+
+			if err := sendOrderCallback(order); err != nil {
+				t.Fatalf("send epay callback: %v", err)
+			}
+			if got := formPayload["type"]; got != tc.epayType {
+				t.Fatalf("type = %q, want %q", got, tc.epayType)
+			}
+
+			signParams := map[string]interface{}{
+				"pid":          formPayload["pid"],
+				"trade_no":     formPayload["trade_no"],
+				"out_trade_no": formPayload["out_trade_no"],
+				"type":         formPayload["type"],
+				"name":         formPayload["name"],
+				"money":        formPayload["money"],
+				"trade_status": formPayload["trade_status"],
+			}
+			calcSig, err := sign.Get(signParams, key.SecretKey)
+			if err != nil {
+				t.Fatalf("calc epay signature: %v", err)
+			}
+			if got := formPayload["sign"]; got != calcSig {
+				t.Fatalf("sign = %q, want %q", got, calcSig)
+			}
+		})
+	}
+}
+
 func TestDispatchPendingCallbacksEpayAcceptsSuccessAck(t *testing.T) {
 	cleanup := testutil.SetupTestDatabases(t)
 	defer cleanup()

src/route/router.go

@@ -15,12 +15,42 @@ import (
 	"github.com/GMWalletApp/epusdt/middleware"
 	"github.com/GMWalletApp/epusdt/model/data"
 	"github.com/GMWalletApp/epusdt/model/mdb"
+	"github.com/GMWalletApp/epusdt/model/service"
 	"github.com/GMWalletApp/epusdt/util/constant"
 	"github.com/GMWalletApp/epusdt/util/sign"
 	"github.com/labstack/echo/v4"
 	echoMiddleware "github.com/labstack/echo/v4/middleware"
 )
 
+// resolveEPayTypeSelector only claims the type as a selector when it maps to a
+// currently supported payment asset; otherwise the caller should keep the
+// legacy token/network/default resolution and treat type as opaque.
+func resolveEPayTypeSelector(rawType string) (string, string, bool, error) {
+	rawType = strings.TrimSpace(rawType)
+	if rawType == "" || strings.Count(rawType, ".") != 1 {
+		return "", "", false, nil
+	}
+
+	parts := strings.SplitN(rawType, ".", 2)
+	token := strings.TrimSpace(parts[0])
+	network := strings.ToLower(strings.TrimSpace(parts[1]))
+	if token == "" || network == "" {
+		return "", "", false, nil
+	}
+	if !data.IsChainEnabled(network) {
+		return "", "", false, nil
+	}
+
+	tokenRow, err := data.GetEnabledChainTokenBySymbol(network, token)
+	if err != nil {
+		return "", "", false, err
+	}
+	if tokenRow == nil || tokenRow.ID == 0 || !service.ChainTokenReadyForPayment(*tokenRow) {
+		return "", "", false, nil
+	}
+	return token, network, true, nil
+}
+
 // RegisterRoute 路由注册
 func RegisterRoute(e *echo.Echo) {
 	e.POST("/", func(c echo.Context) error {
@@ -130,17 +160,27 @@ func RegisterRoute(e *echo.Echo) {
 
 		money := getString(params, "money")
 		name := getString(params, "name")
+		epayType := strings.TrimSpace(getString(params, "type"))
 		notifyURL := getString(params, "notify_url")
 		outTradeNo := getString(params, "out_trade_no")
 		returnURL := getString(params, "return_url")
+		selectorToken, selectorNetwork, selectorMatched, err := resolveEPayTypeSelector(epayType)
+		if err != nil {
+			return comm.Ctrl.FailJson(ctx, constant.SystemErr)
+		}
 		token := strings.TrimSpace(getString(params, "token"))
+		network := strings.TrimSpace(getString(params, "network"))
+		if selectorMatched {
+			token = selectorToken
+			network = selectorNetwork
+		} else {
 			if token == "" {
 				token = data.GetSettingString(mdb.SettingKeyEpayDefaultToken, "")
 			}
-		network := strings.TrimSpace(getString(params, "network"))
 			if network == "" {
 				network = data.GetSettingString(mdb.SettingKeyEpayDefaultNetwork, "")
 			}
+		}
 		currency := strings.TrimSpace(getString(params, "currency"))
 		if currency == "" {
 			currency = data.GetSettingString(mdb.SettingKeyEpayDefaultCurrency, "")
@@ -168,6 +208,7 @@ func RegisterRoute(e *echo.Echo) {
 		}
 
 		ctx.Set("request_body", body)
+		ctx.Set(comm.EPayTypeContextKey, epayType)
 		ctx.Set(middleware.ApiKeyIDKey, apiKeyRow.ID)
 		ctx.Set(middleware.ApiKeyRowKey, apiKeyRow)
 

src/route/router_test.go

@@ -1272,6 +1272,9 @@ func TestEpaySubmitPhpGetCompatible(t *testing.T) {
 	if order.PaymentType != mdb.PaymentTypeEpay {
 		t.Fatalf("epay payment_type = %q, want %q", order.PaymentType, mdb.PaymentTypeEpay)
 	}
+	if order.EpayType != "alipay" {
+		t.Fatalf("epay_type = %q, want alipay", order.EpayType)
+	}
 	checkoutData := getCheckoutCounterRespData(t, e, tradeID)
 	if checkoutData["payment_type"] != "epay" {
 		t.Fatalf("epay checkout payment_type = %v, want epay", checkoutData["payment_type"])
@@ -1327,6 +1330,100 @@ func TestEpaySubmitPhpRequestTokenNetworkOverrideDefaults(t *testing.T) {
 	}
 }
 
+func TestEpaySubmitPhpTypeSelectorOverridesRequestAndDefaults(t *testing.T) {
+	e := setupTestEnv(t)
+
+	if err := data.SetSetting(mdb.SettingGroupEpay, mdb.SettingKeyEpayDefaultToken, "usdc", mdb.SettingTypeString); err != nil {
+		t.Fatalf("seed epay.default_token: %v", err)
+	}
+	if err := data.SetSetting(mdb.SettingGroupEpay, mdb.SettingKeyEpayDefaultNetwork, "solana", mdb.SettingTypeString); err != nil {
+		t.Fatalf("seed epay.default_network: %v", err)
+	}
+	if err := data.SetSetting(mdb.SettingGroupEpay, mdb.SettingKeyEpayDefaultCurrency, "", mdb.SettingTypeString); err != nil {
+		t.Fatalf("clear epay.default_currency: %v", err)
+	}
+
+	values := signEpayValues(url.Values{
+		"pid":          {"1"},
+		"name":         {"epay-type-selector-001"},
+		"type":         {"usdt.tron"},
+		"money":        {"1.00"},
+		"out_trade_no": {"epay-type-selector-001"},
+		"notify_url":   {"https://93.184.216.34/notify"},
+		"return_url":   {"http://localhost/return"},
+		"token":        {"usdc"},
+		"network":      {"solana"},
+	})
+
+	req := httptest.NewRequest(http.MethodGet, "/payments/epay/v1/order/create-transaction/submit.php?"+values.Encode(), nil)
+	rec := httptest.NewRecorder()
+	e.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusFound {
+		t.Fatalf("expected 302, got %d body=%s", rec.Code, rec.Body.String())
+	}
+	tradeID := strings.TrimPrefix(rec.Header().Get("Location"), "/pay/checkout-counter/")
+	order, err := data.GetOrderInfoByTradeId(tradeID)
+	if err != nil {
+		t.Fatalf("reload epay selector order: %v", err)
+	}
+	if order.Token != "USDT" || order.Network != mdb.NetworkTron || order.ReceiveAddress != "TTestTronAddress001" {
+		t.Fatalf("selector order fields = token %q network %q address %q", order.Token, order.Network, order.ReceiveAddress)
+	}
+	if order.Currency != "CNY" {
+		t.Fatalf("currency = %q, want CNY", order.Currency)
+	}
+	if order.EpayType != "usdt.tron" {
+		t.Fatalf("epay_type = %q, want usdt.tron", order.EpayType)
+	}
+}
+
+func TestEpaySubmitPhpTypeSelectorUsesDefaultCurrencyWhenMissing(t *testing.T) {
+	e := setupTestEnv(t)
+
+	if err := data.SetSetting(mdb.SettingGroupEpay, mdb.SettingKeyEpayDefaultToken, "usdc", mdb.SettingTypeString); err != nil {
+		t.Fatalf("seed epay.default_token: %v", err)
+	}
+	if err := data.SetSetting(mdb.SettingGroupEpay, mdb.SettingKeyEpayDefaultNetwork, "solana", mdb.SettingTypeString); err != nil {
+		t.Fatalf("seed epay.default_network: %v", err)
+	}
+	if err := data.SetSetting(mdb.SettingGroupEpay, mdb.SettingKeyEpayDefaultCurrency, "usd", mdb.SettingTypeString); err != nil {
+		t.Fatalf("seed epay.default_currency: %v", err)
+	}
+	if err := data.SetSetting(mdb.SettingGroupRate, "rate.forced_rate_list", `{"cny":{"usdt":0.14285714285714285},"usd":{"usdt":1}}`, mdb.SettingTypeJSON); err != nil {
+		t.Fatalf("seed rate.forced_rate_list for usd: %v", err)
+	}
+
+	values := signEpayValues(url.Values{
+		"pid":          {"1"},
+		"name":         {"epay-type-default-cur-001"},
+		"type":         {"usdt.tron"},
+		"money":        {"1.00"},
+		"out_trade_no": {"epay-type-default-cur-001"},
+		"notify_url":   {"https://93.184.216.34/notify"},
+		"return_url":   {"http://localhost/return"},
+		"token":        {"usdc"},
+		"network":      {"solana"},
+	})
+
+	rec := doFormPost(e, "/payments/epay/v1/order/create-transaction/submit.php", values)
+
+	if rec.Code != http.StatusFound {
+		t.Fatalf("expected 302, got %d body=%s", rec.Code, rec.Body.String())
+	}
+	tradeID := strings.TrimPrefix(rec.Header().Get("Location"), "/pay/checkout-counter/")
+	order, err := data.GetOrderInfoByTradeId(tradeID)
+	if err != nil {
+		t.Fatalf("reload epay selector order: %v", err)
+	}
+	if order.Token != "USDT" || order.Network != mdb.NetworkTron || order.ReceiveAddress != "TTestTronAddress001" {
+		t.Fatalf("selector order fields = token %q network %q address %q", order.Token, order.Network, order.ReceiveAddress)
+	}
+	if order.Currency != "USD" {
+		t.Fatalf("currency = %q, want USD", order.Currency)
+	}
+}
+
 func TestEpaySubmitPhpWithoutTokenNetworkDefaultsCreatesPlaceholder(t *testing.T) {
 	e := setupTestEnv(t)
 
@@ -1365,12 +1462,95 @@ func TestEpaySubmitPhpWithoutTokenNetworkDefaultsCreatesPlaceholder(t *testing.T
 	if order.PaymentType != mdb.PaymentTypeEpay {
 		t.Fatalf("payment_type = %q, want %q", order.PaymentType, mdb.PaymentTypeEpay)
 	}
+	if order.EpayType != "alipay" {
+		t.Fatalf("epay_type = %q, want alipay", order.EpayType)
+	}
 	checkoutData := getCheckoutCounterRespData(t, e, tradeID)
 	if checkoutData["payment_type"] != "epay" || int(checkoutData["status"].(float64)) != mdb.StatusWaitSelect {
 		t.Fatalf("checkout placeholder data = %#v", checkoutData)
 	}
 }
 
+func TestEpaySubmitPhpNonSelectorTypeKeepsOldLogic(t *testing.T) {
+	e := setupTestEnv(t)
+
+	if err := data.SetSetting(mdb.SettingGroupEpay, mdb.SettingKeyEpayDefaultToken, "usdt", mdb.SettingTypeString); err != nil {
+		t.Fatalf("seed epay.default_token: %v", err)
+	}
+	if err := data.SetSetting(mdb.SettingGroupEpay, mdb.SettingKeyEpayDefaultNetwork, "tron", mdb.SettingTypeString); err != nil {
+		t.Fatalf("seed epay.default_network: %v", err)
+	}
+
+	values := signEpayValues(url.Values{
+		"pid":          {"1"},
+		"name":         {"epay-non-selector-001"},
+		"type":         {"usdt-tron"},
+		"money":        {"1.00"},
+		"out_trade_no": {"epay-non-selector-001"},
+		"notify_url":   {"https://93.184.216.34/notify"},
+		"return_url":   {"http://localhost/return"},
+	})
+
+	req := httptest.NewRequest(http.MethodGet, "/payments/epay/v1/order/create-transaction/submit.php?"+values.Encode(), nil)
+	rec := httptest.NewRecorder()
+	e.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusFound {
+		t.Fatalf("expected 302, got %d body=%s", rec.Code, rec.Body.String())
+	}
+	tradeID := strings.TrimPrefix(rec.Header().Get("Location"), "/pay/checkout-counter/")
+	order, err := data.GetOrderInfoByTradeId(tradeID)
+	if err != nil {
+		t.Fatalf("reload epay non-selector order: %v", err)
+	}
+	if order.Token != "USDT" || order.Network != mdb.NetworkTron || order.ReceiveAddress != "TTestTronAddress001" {
+		t.Fatalf("non-selector order fields = token %q network %q address %q", order.Token, order.Network, order.ReceiveAddress)
+	}
+	if order.EpayType != "usdt-tron" {
+		t.Fatalf("epay_type = %q, want usdt-tron", order.EpayType)
+	}
+}
+
+func TestEpaySubmitPhpUnsupportedSelectorFallsBackToOldLogic(t *testing.T) {
+	e := setupTestEnv(t)
+
+	if err := data.SetSetting(mdb.SettingGroupEpay, mdb.SettingKeyEpayDefaultToken, "usdt", mdb.SettingTypeString); err != nil {
+		t.Fatalf("seed epay.default_token: %v", err)
+	}
+	if err := data.SetSetting(mdb.SettingGroupEpay, mdb.SettingKeyEpayDefaultNetwork, "tron", mdb.SettingTypeString); err != nil {
+		t.Fatalf("seed epay.default_network: %v", err)
+	}
+
+	values := signEpayValues(url.Values{
+		"pid":          {"1"},
+		"name":         {"epay-unsupported-selector-001"},
+		"type":         {"usdc.tron"},
+		"money":        {"1.00"},
+		"out_trade_no": {"epay-unsupported-selector-001"},
+		"notify_url":   {"https://93.184.216.34/notify"},
+		"return_url":   {"http://localhost/return"},
+	})
+
+	req := httptest.NewRequest(http.MethodGet, "/payments/epay/v1/order/create-transaction/submit.php?"+values.Encode(), nil)
+	rec := httptest.NewRecorder()
+	e.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusFound {
+		t.Fatalf("expected 302, got %d body=%s", rec.Code, rec.Body.String())
+	}
+	tradeID := strings.TrimPrefix(rec.Header().Get("Location"), "/pay/checkout-counter/")
+	order, err := data.GetOrderInfoByTradeId(tradeID)
+	if err != nil {
+		t.Fatalf("reload epay unsupported selector order: %v", err)
+	}
+	if order.Token != "USDT" || order.Network != mdb.NetworkTron || order.ReceiveAddress != "TTestTronAddress001" {
+		t.Fatalf("unsupported selector order fields = token %q network %q address %q", order.Token, order.Network, order.ReceiveAddress)
+	}
+	if order.EpayType != "usdc.tron" {
+		t.Fatalf("epay_type = %q, want usdc.tron", order.EpayType)
+	}
+}
+
 func TestEpaySubmitPhpRejectsPartialResolvedTokenNetwork(t *testing.T) {
 	e := setupTestEnv(t)
 
@@ -1428,6 +1608,40 @@ func TestEpaySubmitPhpPostFormCompatible(t *testing.T) {
 	}
 }
 
+func TestEpaySubmitPhpTypeSelectorPostFormCompatible(t *testing.T) {
+	e := setupTestEnv(t)
+
+	if err := data.SetSetting(mdb.SettingGroupEpay, mdb.SettingKeyEpayDefaultNetwork, "solana", mdb.SettingTypeString); err != nil {
+		t.Fatalf("seed epay.default_network: %v", err)
+	}
+
+	values := signEpayValues(url.Values{
+		"pid":          {"1"},
+		"name":         {"epay-post-selector-001"},
+		"type":         {"usdt.tron"},
+		"money":        {"1.00"},
+		"out_trade_no": {"epay-post-selector-001"},
+		"notify_url":   {"https://93.184.216.34/notify"},
+		"return_url":   {"http://localhost/return"},
+	})
+
+	rec := doFormPost(e, "/payments/epay/v1/order/create-transaction/submit.php", values)
+	if rec.Code != http.StatusFound {
+		t.Fatalf("expected 302, got %d body=%s", rec.Code, rec.Body.String())
+	}
+	tradeID := strings.TrimPrefix(rec.Header().Get("Location"), "/pay/checkout-counter/")
+	order, err := data.GetOrderInfoByTradeId(tradeID)
+	if err != nil {
+		t.Fatalf("reload epay post selector order: %v", err)
+	}
+	if order.Token != "USDT" || order.Network != mdb.NetworkTron || order.ReceiveAddress != "TTestTronAddress001" {
+		t.Fatalf("post selector order fields = token %q network %q address %q", order.Token, order.Network, order.ReceiveAddress)
+	}
+	if order.EpayType != "usdt.tron" {
+		t.Fatalf("epay_type = %q, want usdt.tron", order.EpayType)
+	}
+}
+
 // TestCheckStatus_NotFound verifies that /pay/check-status/:trade_id returns a
 // graceful JSON error (not 500) when the trade_id doesn't exist.
 func TestCheckStatus_NotFound(t *testing.T) {
@@ -1656,6 +1870,93 @@ func TestPayReturn_PaidEpayRedirectsToMerchantWithSignedParams(t *testing.T) {
 	}
 }
 
+func TestPayReturn_PaidEpayRedirectsWithOriginalType(t *testing.T) {
+	e := setupTestEnv(t)
+	tradeID := mustCreateEPayOrder(t, e, "epay-return-type-001", "https://merchant.example/return", url.Values{
+		"type": {"usdt.tron"},
+	})
+	if err := dao.Mdb.Model(&mdb.Orders{}).
+		Where("trade_id = ?", tradeID).
+		Update("status", mdb.StatusPaySuccess).Error; err != nil {
+		t.Fatalf("mark order paid: %v", err)
+	}
+
+	req := httptest.NewRequest(http.MethodGet, "/pay/return/"+tradeID, nil)
+	rec := httptest.NewRecorder()
+	e.ServeHTTP(rec, req)
+	if rec.Code != http.StatusFound {
+		t.Fatalf("expected 302, got %d: %s", rec.Code, rec.Body.String())
+	}
+
+	targetURL, err := url.Parse(rec.Header().Get("Location"))
+	if err != nil {
+		t.Fatalf("parse redirect location: %v", err)
+	}
+	if got := targetURL.Query().Get("type"); got != "usdt.tron" {
+		t.Fatalf("type = %q, want usdt.tron", got)
+	}
+}
+
+func TestPayReturn_PaidEpayRedirectsWithNonSelectorType(t *testing.T) {
+	e := setupTestEnv(t)
+	tradeID := mustCreateEPayOrder(t, e, "epay-return-non-selector-001", "https://merchant.example/return", url.Values{
+		"type":     {"usdt-tron"},
+		"token":    {"usdt"},
+		"network":  {"tron"},
+		"currency": {"cny"},
+	})
+	if err := dao.Mdb.Model(&mdb.Orders{}).
+		Where("trade_id = ?", tradeID).
+		Update("status", mdb.StatusPaySuccess).Error; err != nil {
+		t.Fatalf("mark order paid: %v", err)
+	}
+
+	req := httptest.NewRequest(http.MethodGet, "/pay/return/"+tradeID, nil)
+	rec := httptest.NewRecorder()
+	e.ServeHTTP(rec, req)
+	if rec.Code != http.StatusFound {
+		t.Fatalf("expected 302, got %d: %s", rec.Code, rec.Body.String())
+	}
+
+	targetURL, err := url.Parse(rec.Header().Get("Location"))
+	if err != nil {
+		t.Fatalf("parse redirect location: %v", err)
+	}
+	if got := targetURL.Query().Get("type"); got != "usdt-tron" {
+		t.Fatalf("type = %q, want usdt-tron", got)
+	}
+}
+
+func TestPayReturn_PaidEpayRedirectsWithUnsupportedSelectorType(t *testing.T) {
+	e := setupTestEnv(t)
+	tradeID := mustCreateEPayOrder(t, e, "epay-return-unsel-001", "https://merchant.example/return", url.Values{
+		"type":     {"usdc.tron"},
+		"token":    {"usdt"},
+		"network":  {"tron"},
+		"currency": {"cny"},
+	})
+	if err := dao.Mdb.Model(&mdb.Orders{}).
+		Where("trade_id = ?", tradeID).
+		Update("status", mdb.StatusPaySuccess).Error; err != nil {
+		t.Fatalf("mark order paid: %v", err)
+	}
+
+	req := httptest.NewRequest(http.MethodGet, "/pay/return/"+tradeID, nil)
+	rec := httptest.NewRecorder()
+	e.ServeHTTP(rec, req)
+	if rec.Code != http.StatusFound {
+		t.Fatalf("expected 302, got %d: %s", rec.Code, rec.Body.String())
+	}
+
+	targetURL, err := url.Parse(rec.Header().Get("Location"))
+	if err != nil {
+		t.Fatalf("parse redirect location: %v", err)
+	}
+	if got := targetURL.Query().Get("type"); got != "usdc.tron" {
+		t.Fatalf("type = %q, want usdc.tron", got)
+	}
+}
+
 func TestPayReturn_UnpaidEpayRedirectsBackToCheckout(t *testing.T) {
 	e := setupTestEnv(t)
 	tradeID := mustCreateEPayOrder(t, e, "epay-return-unpaid-001", "https://merchant.example/return", url.Values{
@@ -2501,6 +2802,9 @@ func TestSwitchNetwork_EpayPlaceholderCompletesChainInPlace(t *testing.T) {
 	if parent.Status != mdb.StatusWaitPay || parent.PaymentType != mdb.PaymentTypeEpay || parent.Network != mdb.NetworkTron || parent.Token != "USDT" || parent.ReceiveAddress == "" {
 		t.Fatalf("parent fields = status %d payment_type %q network %q token %q address %q", parent.Status, parent.PaymentType, parent.Network, parent.Token, parent.ReceiveAddress)
 	}
+	if parent.EpayType != "alipay" {
+		t.Fatalf("parent epay_type = %q, want alipay", parent.EpayType)
+	}
 	if parent.RedirectUrl != "http://localhost/return" {
 		t.Fatalf("stored redirect_url = %q, want merchant raw return_url", parent.RedirectUrl)
 	}
@@ -2616,6 +2920,47 @@ func TestSwitchNetwork_OkPayFromEpayWaitSelectPlaceholder(t *testing.T) {
 	}
 }
 
+func TestSwitchNetwork_EpayChildInheritsOriginalType(t *testing.T) {
+	e := setupTestEnv(t)
+	tradeID := mustCreateEPayOrder(t, e, "epay-switch-child-type-001", "http://localhost/return", url.Values{
+		"type": {"usdt.tron"},
+	})
+
+	rec := doPost(e, "/pay/switch-network", map[string]interface{}{
+		"trade_id": tradeID,
+		"token":    "USDT",
+		"network":  "solana",
+	})
+	if rec.Code != http.StatusOK {
+		t.Fatalf("switch epay parent to solana failed: %d %s", rec.Code, rec.Body.String())
+	}
+	resp := parseResp(t, rec)
+	respData, _ := resp["data"].(map[string]interface{})
+	subTradeID, _ := respData["trade_id"].(string)
+	if subTradeID == "" || subTradeID == tradeID {
+		t.Fatalf("expected child trade_id, got %q", subTradeID)
+	}
+
+	subOrder, err := data.GetOrderInfoByTradeId(subTradeID)
+	if err != nil {
+		t.Fatalf("load sub-order: %v", err)
+	}
+	if subOrder.EpayType != "usdt.tron" {
+		t.Fatalf("sub-order epay_type = %q, want usdt.tron", subOrder.EpayType)
+	}
+	apiKeyRow, err := data.GetApiKeyByID(subOrder.ApiKeyID)
+	if err != nil {
+		t.Fatalf("load api key: %v", err)
+	}
+	params, err := service.BuildEPayResultParams(subOrder, apiKeyRow)
+	if err != nil {
+		t.Fatalf("BuildEPayResultParams(): %v", err)
+	}
+	if params["type"] != "usdt.tron" {
+		t.Fatalf("callback type = %q, want usdt.tron", params["type"])
+	}
+}
+
 func TestSwitchNetwork_OkPayIntegration(t *testing.T) {
 	shopID := strings.TrimSpace(os.Getenv("EPUSDT_OKPAY_ID"))
 	if shopID == "" {