Nike Coupon Code Generator

I need someone to make a program that will produce [login to view URL] coupon codes. The program must produce 10% 15% and 20% off codes. You need to find an algorithm or a way to generate working codes. The program must create the codes and then automatically test the codes. I am also going to manually test each code so this isn't the biggest factor. I have sample nike codes that can used and looked at when developing this. Please put the project name in your proposal and understand what this is before bidding. Thanks!