微信小程序 支付功能开发错误总结
微信小程序支付终于踩完坑了,发现里面坑挺大的,现在发个贴,希望以后入坑的同学可以看一下 :
https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=7_4&index=2
业务流程在这里大家看文档的时候可以看到。第一个坑,获取用户的openid,参数一定要拼在url连接上,否则会报{"errcode":40013,"errmsg":"invalid appid, hints: [ req_id: iil1ba0504ns86 ]"}错误
onLoad: function () {
var that = this
wx.login({
success: function (res) {
if (res.code) {
//发起网络请求
wx.request({
url: 'https://api.weixin.qq.com/sns/jscode2session?appid=wxaacf22345345cfc7162fe3&secret=83ebd41c3e6f34a49b3a34578063434548ff3f71&js_code=' + res.code + '&grant_type=authorization_code',
method: "POST",
success: function (res) {
that.setData({
openid: res.data.openid
})
}
})
} else {
console.log('获取用户登录态失败!' + res.errMsg)
}
}
});
}
第二个坑,支付统一下单接口,签名这个坑是比较多人遇到问题的这个是MD5加密经常和签名工具里面的加密签名不一样
签名加密工具地址:https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=20_1
签名加密的时候要转成utf-8,加密我用自己的接口进行加密的 digest.update(data.getBytes("utf-8"));
// 统一下单接口获取sign(签名)
paysignjsapi: function (appid, attach, body, mch_id, nonce_str, notify_url, openid, out_trade_no, spbill_create_ip, total_fee, trade_type, key) {
var self = this;
//加密签名
wx.request({
url: 'http://localhost:8080/XinXingWXApi/wxXcxApi/Md5Encrypt.do',
method: 'GET',
data: {
appid: appid,
attach: attach,
body: body,
mch_id: mch_id,
nonce_str: nonce_str,
notify_url: notify_url,
openid: openid,
out_trade_no: out_trade_no,
spbill_create_ip: spbill_create_ip,
total_fee: total_fee,
trade_type: trade_type,
key: key
},
//统一下单
success: function (res) {
var sign = res.data.strMd5
var formData = "<xml>"
formData += "<appid>" + appid + "</appid>" //appid
formData += "<attach>" + attach + "</attach>" //附加数据
formData += "<body>" + body + "</body>" //标题
formData += "<mch_id>" + mch_id + "</mch_id>" //商户号
formData += "<nonce_str>" + nonce_str + "</nonce_str>" //随机字符串,不长于32位。
formData += "<notify_url>" + notify_url + "</notify_url>" //异步接收微信支付结果通知的回调地址
formData += "<openid>" + openid + "</openid>" //用户Id
formData += "<out_trade_no>" + out_trade_no + "</out_trade_no>" //商户订单号
formData += "<spbill_create_ip>" + spbill_create_ip + "</spbill_create_ip>"
formData += "<total_fee>" + total_fee + "</total_fee>" //金额
formData += "<trade_type>" + trade_type + "</trade_type>" //公共号支付
formData += "<sign>" + sign + "</sign>"//签名
formData += "</xml>"
返回数据解析xml
//请求统一下单接口
wx.request({
url: "https://api.mch.weixin.qq.com/pay/unifiedorder",
method: 'POST',
data: formData,
success: function (data) {
wx.request({
url: "http://localhost:8080/XinXingWXApi/wxXcxApi/xmlAnalyze.do?strXml=" + data.data,
method: 'POST',
success: function (res) {
var pk = 'prepay_id=' + res.data.prepayId;
var timeStamp = self.createTimeStamp();
//获取支付签名,并支付
self.getsignType(appid, timeStamp, nonce_str, pk, "MD5", key);
}
})
}
})
}
});
}
第三就是调用支付了,这里也有几个小坑,第一就是appId很多写成appid就不行了,第二个就是preoatid 的参数格式要写对prepay_id=wx2017011711060194dccf725232155886323 第三个就是调用支付的时候报支付签名错误,也需要到签名接口查看签名是否一致,查看参数是否是对的,调用微信支付的时候必须加上appId
getsignType: function (appid, timeStamp, nonce_str, pk, signType, key) {
var that = this;
wx.request({
url: "http://localhost:8080/XinXingWXApi/wxXcxApi/getSignType.hn",
method: 'GET',
data: {
appId: appid,
timeStamp: timeStamp,
nonceStr: nonce_str,
pk: pk,
signType: signType,
key: key
},
success: function (res) {
console.log(res.data.paySign)
var paySign = res.data.paySign
//调用微信支付
wx.requestPayment({
'appId': appid,
'timeStamp': timeStamp,
'nonceStr': nonce_str,
'package': pk,
'signType': 'MD5',
'paySign': paySign,
'success': function (res) {
console.log(res);
console.log('success');
},
'fail': function (res) {
console.log(res);
console.log('fail');
},
'complete': function (res) {
// console.log(res);
console.log('complete');
}
});
}
})
}