微信支付插件：cordova-plugin-wechat
文档地址：https://jasonz1987.github.io/cordova-wechat-docs/docs/get-started
发起支付—官方文档代码如下：

var params = {
   partnerid: '10000100', // merchant id
   prepayid: 'wx201411101639507cbf6ffd8b0779950874', // prepay id
   noncestr: '1add1a30ac87aa2db72f57a2375d8fec', // nonce
   timestamp: '1439531364', // timestamp
   sign: '0CB01533B8C1EF103065174F50BCA001', // signed string
 };

 Wechat.sendPaymentRequest(ret.data, function () {
   alert("Success");
 }, function (reason) {
   alert("Failed: " + reason);
 });

这个官方文档还少了两个参数，导致我折腾老半天。

var params = {
   appid: 'fnsdiufnsadfnaisdfni',  // appid
   package: 'XXXXX', // package
   partnerid: '10000100', // merchant id
   prepayid: 'wx201411101639507cbf6ffd8b0779950874', // prepay id
   noncestr: '1add1a30ac87aa2db72f57a2375d8fec', // nonce
   timestamp: '1439531364', // timestamp
   sign: '0CB01533B8C1EF103065174F50BCA001', // signed string
 };