1、介绍
在我接这个接口的时候，官方并没有明确给出合单支付支持小程序支付，凭借一腔热血去尝试了一下可以成功，prepay_id就是调用JS合单支付获取的。现在再看文档，已经明确列出来了“小程序调起支付”的字眼。所以大家可以放心的接入小程序合单支付哈。支付场景较多，系列文章只介绍小程序合单支付，APP合单支付、JS合单支付依瓢画葫芦，都一样哈。要注意，合单中同一个二级商户只允许有一笔子订单。订单如果需要进行分账等，需要在合单中指定需要进行分账（profit_sharing为true）。
文档地址：
https://pay.weixin.qq.com/wiki/doc/apiv3/wxpay/pay/combine/chapter3_2.shtml
2、创建参数实体
按文档创建参数实体类。
参数实体JsapiParam：
代码语言：javascript复制@Data
public class JsapiParam {
private String combine_appid;
private String combine_mchid;
private String combine_out_trade_no;
private SceneInfo scene_info;
private List<SubOrder> sub_orders;
private CombinePayerInfo combine_payer_info;
private String time_start;
private String time_expire;
private String notify_url;
private String limit_pay;
}参数实体SceneInfo：
代码语言：javascript复制@Data
public class SceneInfo {
private String device_id;
private String payer_client_ip;
}参数实体SubOrder：
代码语言：javascript复制@Data
public class SubOrder {
private String mchid;
private String attach;
private Amount amount;
private String out_trade_no;
private String sub_mchid;
private String detail;
private Boolean profit_sharing;
private String description;
private SettleInfo settle_info;
}参数实体CombinePayerInfo：
代码语言：javascript复制@Data
public class CombinePayerInfo {
private String openid;
}参数实体Amount：
代码语言：javascript复制@Data
public class Amount {
private Integer total_amount;
private String currency;
}参数实体SettleInfo：
代码语言：javascript复制@Data
public class SettleInfo {
private Boolean profit_sharing;
private Integer subsidy_amount;
}3、生成预支付交易会话标识prepay_id
代码语言：javascript复制public static JSONObject jsapi(JsapiParam param) {
String requestParam = JSON.toJSONString(param);
logger.info("jsapi param:{}",requestParam);
HttpResponse response = HttpUtils.v3HttpExecute("POST", TransactionsUrl.JSAPI,
"自己系统的应用名称","服务商商户号","商户API证书序列号","平台证书序列号",requestParam,"商户API证书位置.pem",null);
JSONObject body = JSONObject.parseObject(response.body());
logger.info("jsapi heads result:{}",response.headers());
logger.info("jsapi body result:{}",body);
return body;
}
public static void main(String[] args) {
JsapiParam jsapiParam = new JsapiParam();
jsapiParam.setCombine_appid("服务商appid");
jsapiParam.setCombine_mchid("服务商商户号");
jsapiParam.setCombine_out_trade_no("out_trade_no1_" System.currentTimeMillis() "");
SceneInfo sceneInfo = new SceneInfo();
sceneInfo.setDevice_id("POS1:12");
sceneInfo.setPayer_client_ip("14.17.22.32");
jsapiParam.setScene_info(sceneInfo);
SubOrder subOrder = new SubOrder();
subOrder.setMchid("服务商商户号");
subOrder.setAttach("123&456&789");
Amount amount = new Amount();
amount.setTotal_amount(1);
amount.setCurrency("CNY");
subOrder.setAmount(amount);
subOrder.setOut_trade_no("out_trade_no2_" System.currentTimeMillis() "");
subOrder.setSub_mchid("二级商户商户号");
subOrder.setDetail("商品详细描述" subOrder.getSub_mchid());
subOrder.setProfit_sharing(true);
subOrder.setDescription("商品" subOrder.getSub_mchid());
List<SubOrder> subOrders = new ArrayList<>();
subOrders.add(subOrder);
jsapiParam.setSub_orders(subOrders);
CombinePayerInfo combinePayerInfo = new CombinePayerInfo();
combinePayerInfo.setOpenid("服务商appid对应下的openid");
jsapiParam.setCombine_payer_info(combinePayerInfo);
String a = DateFormatUtils.format(new Date(),"yyyy-MM-dd'T'HH:mm:ssZZ");
System.out.println("a=====" a);
jsapiParam.setTime_start(a);
jsapiParam.setNotify_url("https://yourapp.com/notify");
jsapi(jsapiParam);
}
获取的结果
4、计算签名值
签名规则：
https://pay.weixin.qq.com/wiki/doc/apiv3/wxpay/pay/combine/chapter3_8.shtml
代码语言：javascript复制public static String paySign(String mchAppid,String timestamp,String nonceStr,String packageParam,String mchPrivateKeyPath) {
try {
//商户私钥
String mchPrivateKey = CertificateUtils.getPrivateKey(mchPrivateKeyPath);
logger.info("timestamp：{}，nonceStr：{}",timestamp,nonceStr);
//拼签名串
StringBuilder sb = paySignMessage(mchAppid,timestamp,nonceStr,packageParam);
logger.info("paySign original string:{}",sb.toString());
//计算签名
String paySign = new String(Base64.encodeBase64(v3signRSA(sb.toString(),mchPrivateKey)));
logger.info("paySign result:{}",paySign);
return paySign;
} catch (Exception e) {
logger.error("authorization Exception result:{}",e);
e.printStackTrace();
return null;
}
}5、小程序端测试
将参加签名timeStamp、nonceStr、package以及签名结果paySign传给小程序端，paySign默认为RSA，即可在小程序端唤起支付
例如：
代码语言：javascript复制wx.requestPayment(
{
"timeStamp": "1414561699",
"nonceStr": "5K8264ILTKCH16CQ2502SI8ZNMTM67VS",
"package": "prepay_id=wx201410272009395522657a690389285100",
"signType": "RSA",
"paySign": "oR9d8PuhnIc YZ8cBHFCwfgpaK9gd7vaRvkYD7rthRAZ/X QBhcCYL21N7cHCTUxbQ EAt6Uy lwSN22f5YZvI45MLko8Pfso0jm46v5hqcVwrk6uddkGuT Cdvu4WBqDzaDjnNa5UK3GfE1Wfl2gHxIIY5lLdUgWFts17D4WuolLLkiFZV JSHMvH7eaLdT9N5GBovBwu5yYKUR7skR8Fu LozcSqQixnlEZUfyE55feLOQTUYzLmR9pNtPbPsu6WVhbNHMS3Ss2 AehHvz n64GDmXxbX IOBvm2olHu3PsOUGRwhudhVf7UcGcunXt8cqNjKNqZLhLw4jq/xDg==",
})6、结果
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