diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/ApplymentsStatusResult.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/ApplymentsStatusResult.java
index 7defd2145..b3704d652 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/ApplymentsStatusResult.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/ApplymentsStatusResult.java
@@ -7,6 +7,10 @@ import lombok.NoArgsConstructor;
 import java.io.Serializable;
 import java.util.List;
 
+/**
+ * 二级商户进件 查询申请状态结果响应
+ *
+ */
 @Data
 @NoArgsConstructor
 public class ApplymentsStatusResult implements Serializable {
diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/CombineTransactionsJsResult.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/CombineTransactionsJsResult.java
index f8f826cbe..7a33ec840 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/CombineTransactionsJsResult.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/CombineTransactionsJsResult.java
@@ -6,10 +6,24 @@ import lombok.NoArgsConstructor;
 
 import java.io.Serializable;
 
+/**
+ * 合单支付 JSAPI支付结果响应
+ */
 @Data
 @NoArgsConstructor
 public class CombineTransactionsJsResult implements Serializable {
 
+  /**
+   * <pre>
+   * 字段名：预支付交易会话标识
+   * 变量名：prepay_id
+   * 是否必填：是
+   * 类型：string(64)
+   * 描述：
+   *  数字和字母。微信生成的预支付会话标识，用于后续接口调用使用。
+   *  示例值：wx201410272009395522657a690389285100
+   * </pre>
+   */
   @SerializedName("prepay_id")
   private String prepayId;
 
diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/EcommerceService.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/EcommerceService.java
index 5c86306b9..066fe372c 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/EcommerceService.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/EcommerceService.java
@@ -1,8 +1,6 @@
 package com.github.binarywang.wxpay.service;
 
-import com.github.binarywang.wxpay.bean.ecommerce.ApplymentsRequest;
-import com.github.binarywang.wxpay.bean.ecommerce.ApplymentsResult;
-import com.github.binarywang.wxpay.bean.ecommerce.ApplymentsStatusResult;
+import com.github.binarywang.wxpay.bean.ecommerce.*;
 import com.github.binarywang.wxpay.exception.WxPayException;
 
 /**
@@ -55,4 +53,15 @@ public interface EcommerceService {
    */
   ApplymentsStatusResult queryApplyStatusByOutRequestNo(String outRequestNo) throws WxPayException;
 
+  /**
+   * <pre>
+   * 合单下单-JS支付API.
+   * 请求URL：https://api.mch.weixin.qq.com/v3/combine-transactions/jsapi
+   * 文档地址: https://pay.weixin.qq.com/wiki/doc/apiv3/wxpay/pay/combine/chapter3_2.shtml
+   * </pre>
+   *
+   * @param request 请求对象
+   * @return 预支付交易会话标识, 数字和字母。微信生成的预支付会话标识，用于后续接口调用使用。
+   */
+  CombineTransactionsJsResult combineTransactions(CombineTransactionsJsRequest request) throws WxPayException;
 }
diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/EcommerceServiceImpl.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/EcommerceServiceImpl.java
index 963163127..fe916819e 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/EcommerceServiceImpl.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/EcommerceServiceImpl.java
@@ -1,8 +1,6 @@
 package com.github.binarywang.wxpay.service.impl;
 
-import com.github.binarywang.wxpay.bean.ecommerce.ApplymentsRequest;
-import com.github.binarywang.wxpay.bean.ecommerce.ApplymentsResult;
-import com.github.binarywang.wxpay.bean.ecommerce.ApplymentsStatusResult;
+import com.github.binarywang.wxpay.bean.ecommerce.*;
 import com.github.binarywang.wxpay.exception.WxPayException;
 import com.github.binarywang.wxpay.service.EcommerceService;
 import com.github.binarywang.wxpay.service.WxPayService;
@@ -41,5 +39,12 @@ public class EcommerceServiceImpl implements EcommerceService {
     return GSON.fromJson(result, ApplymentsStatusResult.class);
   }
 
+  @Override
+  public CombineTransactionsJsResult combineTransactions(CombineTransactionsJsRequest request) throws WxPayException {
+    String url = String.format("%s/v3/combine-transactions/jsapi", this.payService.getPayBaseUrl());
+    String response = this.payService.postV3(url, GSON.toJson(request));
+    return GSON.fromJson(response, CombineTransactionsJsResult.class);
+  }
+
 
 }