fix: 修复BepUsdt配置解析失败导致签名错误（JSON数值类型无法Unmarshal到map[string]string）

backend/internal/api/handlers/payment.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"log"
 	"net/http"
 	"sort"
 	"strconv"
@@ -57,8 +58,7 @@ func (h *PaymentHandler) CreatePayment(c *gin.Context) {
 	}
 
 	channel := channels[0]
-	var config map[string]string
-	json.Unmarshal([]byte(channel.Config), &config)
+	config := parseChannelConfig(channel.Config)
 
 	apiURL := strings.TrimSuffix(config["bepusdt_api_url"], "/")
 	apiToken := config["bepusdt_api_token"]
@@ -93,8 +93,8 @@ func (h *PaymentHandler) CreatePayment(c *gin.Context) {
 
 	signature := signBepUsdt(params, apiToken)
 
-	fmt.Printf("[BepUsdt] signature params: %v\n", params)
-	fmt.Printf("[BepUsdt] signature: %s, token: %s\n", signature, apiToken)
+	log.Printf("[BepUsdt] signature params: %v", params)
+	log.Printf("[BepUsdt] signature: %s, token: %s", signature, apiToken)
 
 	reqBody := BepUsdtCreateRequest{
 		TradeType:   tradeType,
@@ -107,7 +107,7 @@ func (h *PaymentHandler) CreatePayment(c *gin.Context) {
 	}
 
 	body, _ := json.Marshal(reqBody)
-	fmt.Printf("[BepUsdt] request body: %s\n", string(body))
+	log.Printf("[BepUsdt] request body: %s", string(body))
 	resp, err := http.Post(apiURL+"/api/v1/order/create-transaction", "application/json", strings.NewReader(string(body)))
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to connect payment gateway"})
@@ -117,7 +117,7 @@ func (h *PaymentHandler) CreatePayment(c *gin.Context) {
 
 	respBody, _ := io.ReadAll(resp.Body)
 
-	fmt.Printf("[BepUsdt] response: %s\n", string(respBody))
+	log.Printf("[BepUsdt] response: %s", string(respBody))
 
 	var result map[string]interface{}
 	json.Unmarshal(respBody, &result)
@@ -209,8 +209,7 @@ func (h *PaymentHandler) BepUsdtNotify(c *gin.Context) {
 	}
 
 	channel := channels[0]
-	var config map[string]string
-	json.Unmarshal([]byte(channel.Config), &config)
+	config := parseChannelConfig(channel.Config)
 	apiToken := config["bepusdt_api_token"]
 
 	stringParams := make(map[string]string)
@@ -268,3 +267,39 @@ func signBepUsdt(params map[string]string, token string) string {
 	hash := md5.Sum([]byte(str))
 	return hex.EncodeToString(hash[:])
 }
+
+func parseChannelConfig(configStr string) map[string]string {
+	result := make(map[string]string)
+	if configStr == "" {
+		return result
+	}
+	var raw map[string]interface{}
+	if err := json.Unmarshal([]byte(configStr), &raw); err != nil {
+		var rawStr map[string]string
+		if err2 := json.Unmarshal([]byte(configStr), &rawStr); err2 == nil {
+			return rawStr
+		}
+		log.Printf("[BepUsdt] failed to parse channel config: %v", err)
+		return result
+	}
+	for k, v := range raw {
+		if v == nil {
+			continue
+		}
+		switch val := v.(type) {
+		case string:
+			result[k] = val
+		case float64:
+			if val == float64(int64(val)) {
+				result[k] = strconv.FormatInt(int64(val), 10)
+			} else {
+				result[k] = strconv.FormatFloat(val, 'f', -1, 64)
+			}
+		case bool:
+			result[k] = strconv.FormatBool(val)
+		default:
+			result[k] = fmt.Sprintf("%v", val)
+		}
+	}
+	return result
+}