Need someone to integrate payment gateway (Orbital payment gateway) from Chase paymentech

I need someone that can do this work NOW, ASAP!!! I have a single order page that is attached to this project. I need someone who is experienced in integrating with Chase paymentech payment gateway. The order form also needs to do a simple math formula to determine the price before the customer checkouts out. the formula for calculating the price is below: There are 2 options: 1. (Length X Width of boat) X $7.00 (upper level) = Price 2. (Length X Width of boat) X $8.50 (lower level) = Price After customer inputs length/width of boat and chooses (upper/lower) level option then the page will automatically calculates the price. Then the customer simply fills out the billing info below and goes to a receipt page. Thats it.