BarclayCard ePDQ MPI - XML API Integration

I am looking for a dedicated PHP developer with experience working with XML API's passing data between servers, retrieving a response and parsing key data into variables. I know PHP quite well, just not well enough to develop a API - yet. Here is the developer guide: [login to view URL] It would be ideal if the system had AJAX integrated so it sent a transaction on the fly without the user leaving the page and returned an AJAX error response based on the API or success message, at which point - on success, I would like to run my own script to create a user account etc. Many thanks Guys. I am looking for this to be of high quality and by Monday - for a reasonable price.