PHP Soap我该怎么办？

I have this web service

{
    "UserName":"testing_user",  
    "Password":"pxt_rws_nsg",  
    "mid":"76074",  
    "cid":"260",  
    "Amount":"10.00",  
    "TransactionType":"1",  
    "Track2":"",  
    "ZipCode":"32606",  
    "CVN":"",  
    "CardNumber":"4111111111111111",  
    "ExpDate":"0817",  
    "NameOnCard":"Test",  
    "reversalid":"1",  
    "AppKey":"a8dcdf14-11c6-4201-a95e-a0512818c98f",  
    "AppType":"11021",  
    "HostUserName":"",  
    "HostPassword":"",  
    "UserTransactionNumber":"635846721314374531"  
}

Somebody can show me how I need to make the PHP/SOAP code.