Pay first for AEC - Joomla Membership

I want to set up a payment page for the AEC component (Account Expiration Control) for Joomla whereby the user pays FIRST, then an account is automatically created (email as username, random password assigned). Right now you have to register, then login, then pay for a membership. That slows down the "buy" process and many people don't complete it. I use C20 and Paypal, which are both included in AEC's core capability. Requires a Joomla expert - you MUST be familiar with AEC. Do not apply for this job if you don't already know how to do it - I've had several people say they could program this, when they can't. For the right person I have additional programming work: show me what you can do first though!