Need API Tied into current registration

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
You will tie in an API kit into my current registration page. Slightly complex, do not bid if not capable, please do not waste your time, or my time. Thank you.

Submission of a request is a simple two-step process in which you send a request to the system post URL and receive a response. The URL to send this request is given in (A) below.

The request takes the form of a typical GET or POST HTTP request, performed through a URL as shown in (B), or an HTML form as shown in (C).

A valid request consists of at least 12 required fields and their values, all listed in (D) below, The field names cannot be changed and are case-sensitive. You may include any of the optional fields listed in (E) below.

The response is XML-formatted text for consumption by your method of choice. The various formats and examples of a response are given in (F).

C. POST request example:

......the rest of the api upon contact.

Skills required:
AJAX, jQuery / Prototype, PHP, Software Architecture
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