feat: add wechat pay

backend/pkg/utils/order.go

@@ -0,0 +1,15 @@
+package utils
+
+import (
+	"fmt"
+	"math/rand"
+	"strings"
+	"time"
+)
+
+// GenerateOrderSerial generate order serial
+func GenerateOrderSerial(prefix string) string {
+	timestamp := time.Now().Format("20060102150405")
+	randomSuffix := rand.Intn(10000)
+	return fmt.Sprintf("%s%s%04d", strings.ToUpper(prefix), timestamp, randomSuffix)
+}