https://a.xfpay.cn/Api/ApiHandler.ashx?p0_Cmd=TradeByCrossDomain&p1_MerId=15932554345&p2_Amount=&p3_plat=2000&p5_subject=&p6_Notify_Url=&p10_MerOrderNo=&hmac=07C31CD283EAA1B0423A9CD993E3498F