Securely submit a form - *changed budget*

Hi, We have a PHP application form on our website that sends data and receives an XML response. Currently we are using a GET method to process this, however we just received this notification from the company we send our data too: NOTE that as from v7, the option to send data via the QueryString on a GET call will be withdrawn. This is to safeguard the privacy of our applicants’ data. All data must be sent in the body of the request where it will be securely encrypted using normal SSL protocols. We are looking for a freelancer that can alter our system so it will comply with the above. Hopefully it should be pretty straight forward. Lowest bids & best feedback will be favored.