Automatic promo code generator/checker bot

This is for nike website. Background: Before you checkout at the nike website there is a place to enter promo codes. I need a windows software/bot that will randomly generate codes and check these codes at nike website until it finds some working codes. The code consist of 15 characters and the last 8 characters are randomized (alphanumeric). Familiarity of how nike website works is a plus. Let me know if you can do this.