预下单接口请求成功了：{result_code=SUCCESS, sign=A34E0DC441DBCBE9B089A6E43ECDE332E2953734A2145ADA2CC58DD9020B7E1F, mch_id=1501831111, prepay_id=wx130919524584585ba4f895f3dda0f70000, return_msg=OK, appid=wx22510db262684058, nonce_str=vJyHOFgqUQ6mvfQD, return_code=SUCCESS, device_info=WEB, trade_type=APP}

{sign=E6F5C7FE5FC4EAFD21D8B6785F86D6C3, timestamp=1602552024, noncestr=IQ6Tn6ForNSGunM63snRNZuOV5TreCmv, partnerid=1501831111, prepayid=wx130919524584585ba4f895f3dda0f70000, package=Sign=WXPay, appid=wx22510db262684058}微信调起支付失败之后什么提示信息都没有吗？就第一次登陆微信的时候好像提示过一次签名失败，调起微信支付失败的错误码怎么捕捉？