We have an urgent need (less than 24hr to complete) for the integration of coupon functionality to our web service. We've already constructed the paypal pro integration, just need to link up the coupon database so that a user can input the code, have it referenced against our database and reflect a discount in the final price. State tax must be applied and is already accounted for but must be integrated into the final calculation.
This project is time sensitive and you will have access to the original developer for questions. We need the project complete by 3pm PST on Apr 25, 2012.