wxfaceapp.facePay({

 success(res){

 console.log("success [launchFaceApp]")

 console.log(res.replyCode)

 console.log(res.reply)

 },

 fail(res){

 console.log("fail [launchFaceApp]")

 console.log(res.replyCode)

 console.log(res.reply)

 }

})

返回只有成功与失败，金额是怎么传入支付的？