{
        "appId": "wx2421b1c4370ec43b",     //公众号ID，由商户传入     
        "timeStamp": "1395712654",     //时间戳，自1970年以来的秒数     
        "nonceStr": "e61463f8efa94090b1f366cccfbbb444",      //随机串     
        "package": "prepay_id=wx21201855730335ac86f8c43d1889123400",
        "signType": "RSA",     //微信签名方式：     
        "paySign": "oR9d8PuhnIc+YZ8cBHFCwfgpaK9gd7vaRvkYD7rthRAZ\/X+QBhcCYL21N7cHCTUxbQ+EAt6Uy+lwSN22f5YZvI45MLko8Pfso0jm46v5hqcVwrk6uddkGuT+Cdvu4WBqDzaDjnNa5UK3GfE1Wfl2gHxIIY5lLdUgWFts17D4WuolLLkiFZV+JSHMvH7eaLdT9N5GBovBwu5yYKUR7skR8Fu+LozcSqQixnlEZUfyE55feLOQTUYzLmR9pNtPbPsu6WVhbNHMS3Ss2+AehHvz+n64GDmXxbX++IOBvm2olHu3PsOUGRwhudhVf7UcGcunXt8cqNjKNqZLhLw4jq\/xDg==" //微信签名 
    }

wx.requestPayment({
  timeStamp: String(raw.timeStamp),                 // v3 必须字符串
    nonceStr: raw.nonceStr,
    package: String(raw.package || '').startsWith('prepay_id=')
      ? raw.package
      : `prepay_id=${raw.package}`,                    // 补前缀
    signType: raw.signType || 'RSA',                   // v3 固定 RSA
    paySign: raw.paySign, 
    success: () => resolve(),     // 只代表用户输密码成功，不是最终结果
     fail: (err) => reject(err),   // 用户取消 / 失败
})