签名出错

[tongxurt]

svc := jsapi.JsapiApiService{Client: client}
resp, result, err := svc.PrepayWithRequestPayment(ctx,
jsapi.PrepayRequest{
Appid: core.String("wxb0008ff0fb65a736"),
Mchid: core.String("1725227465"),
Description: core.String("Image形象店-深圳腾大-QQ公仔"),
OutTradeNo: core.String("1217752501201"),
NotifyUrl: core.String("https://www.weixin.qq.com/wxpay/pay.php"),
Amount: &jsapi.Amount{
Total: core.Int64(100),
},
Payer: &jsapi.Payer{
Openid: core.String("oyetIvj0rDA6unzW4BnlTOPYjpnA"),
},
},
)

fmt.Println(resp, result, err)

为什么sdk的签名竟然会失败