Authorize.net API Integration - CORE PHP - Deadline 1 day

We need a freelancer for the following URGENT Task: Use Core PHP and integrate [login to view URL] API for 2 or 3 products. This is NOT any plugin work, this is Core PHP project, and you need to go to [login to view URL] and get the API code, and make it work with our code. The software must also charge the clients every month automatically on the same date, and have a place in the back-end where clients can update, delete, or add their credit card. So this means some small billing system along with [login to view URL] needs to be there. OR if it is easier, we can ask the client to sign up for [login to view URL]'s recurring payment module, but [login to view URL] would need to communicate each month if card was approved or declined to the back-end system and alert the client if needed. Who can apply: Senior PHP developers who have worked on [login to view URL] API integration with CORE PHP You must be available during this weekend You must be willing to work LONG HOURS, we have a deadline to meet. Here's the good news, if you do a great job, we will use you from now on when our team is busy and we need some extra help.