feat: 可自定义支付回调地址及最低购买数量

service/epay.go

@@ -0,0 +1,10 @@
+package service
+
+import "one-api/common"
+
+func GetCallbackAddress() string {
+	if common.CustomCallbackAddress == "" {
+		return common.ServerAddress
+	}
+	return common.CustomCallbackAddress
+}