两个小程序绑定同一个商户，拉起收银台的时候提示：商户传入的appId参数不正确？

背景：两个小程序已经绑定过商户（普通商户），商户号1605718524，已开通微信支付，前置条件都满足

支付场景：云开发调用预支付，返回payment给小程序拉起收银台，收银台报错如下：

预支付请求入参如下：

{

"body": "3日游 | 象山精华景点游+海鲜盛宴之旅哈哈哈哈哈哈哈哈哈哈哈哈",

"outTradeNo": "2d44d6c2614eb4e30f439d264c48930d",

"totalFee": 10000,

"openid": "o119h5bwQtlkfm4PUcUWcGkQ8jpo",

"functionName": "tourism",

"envId": "dev-1gpp53ju3ceb46c7",

"subMchId": "1605718524",

"sub_appid": "wxaeb8d093518a4aad",

"nonceStr": "R7bDnDxRT6xc5HRhaAc4whKQsCeaprTM",

"spbillCreateIp": "127.0.0.1",

"tradeType": "JSAPI"

}

返回的结果：{

"tradeOrderId":"2d44d6c2614eb4e30f439d264c48930d",

"paymentOrderId":"wx251334280569596975fe2429e5e60c0000",

"prePayRes":{"appid":"wxd2d16a504f24665e","sign":"1D9D867ED023D68094E72FF94A7A08CC","payment":{"appId":"wx374ece47fdd73853","timeStamp":"1632548068","nonceStr":"400MLDo32H5plXyj","package":"prepay_id=wx251334280569596975fe2429e5e60c0000","signType":"MD5","paySign":"9835F5629E111446B28C4AD9795A2C74"},"returnCode":"SUCCESS","returnMsg":"OK","mchId":"1800008281","subAppid":"wx374ece47fdd73853","subMchId":"1605718524","nonceStr":"400MLDo32H5plXyj","resultCode":"SUCCESS","tradeType":"JSAPI","prepayId":"wx251334280569596975fe2429e5e60c0000","errCode":0,"errMsg":"cloudPay.unifiedOrder:ok"}}

猜测原因：1，我们是跨环境调用，a小程序调用b小程序的云函数，

2，注意------>入参的appid 和返回的payment里边的appid不是同一个

3，其他原因

跪求官方，或者遇到类似问题的同学解答一下。