请求地址： https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi

参数：

{
	"amount": {
		"currency": "CNY",
		"total": 1
	},
	"appid": "wx63860c1b7ddb5aeb",
	"description": "商品描述",
	"mchid": "1619496548",
	"notify_url": "http://weiboauc.com/wxNotify",
	"out_trade_no": "027bb923e382494185665498aa70652e",
	"payer": {
		"openid": "oNLA_4wvMFLBb0YvdAsK2KCKp96Y"
	}
}