微信开放平台: https://developers.weixin.qq.com/doc/oplatform/Third-party_Platforms/2.0/getting_started/terminology_introduce.html 统一下单: https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=9_1 支付结果通知: https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=9_7&index=3 付款到零钱: https://pay.weixin.qq.com/wiki/doc/api/tools/mch_pay.php?chapter=14_1 支付相关: WeChatPayController