I was just wondering if there is any functionality to the promotional code field when you register. I had another auction script that I was testing before I purchased this one and you were able to set up promotion codes in the admin panel so that when a new user entered a promotional code it would automatically credit there account with a set amount of money according to the code they entered. I do not see anywhere in this admin panel to customize the promotional codes.
There is a file in your data directory called "PromotionalCodes.txt", edit this file and you can insert unlimited code and their credit values and these values will be automatically credited to their accounts after activation.