微信小程序调起支付

商户通过JSAPI/小程序下单接口获取到发起支付的必要参数prepay_id后，然后使用微信支付提供的小程序方法调起微信支付 调起微信支付收银台。

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==",
    "success": function (res) {
    },
    "fail": function (res) {
    },
    "complete": function (res) {
    }
})