PHP script required for Joomla integration

I am in need of a php script which I can integrate into a joomla website (perhaps a joomla module?). The PHP script is basically a dynamic form which will send the information to a 3rd party (affiliate) website and then receive data back (XML)which needs to be displayed. I have a list of the URL’s where post data from the form needs to be posted to generate an XML file which then needs to be parsed into a style sheet. This will be almost identical to [login to view URL] but in PHP of course. I have all the field names required etc. This will form a small part of a much bigger site so there is potential for lots of work for a good programmer in the future.