CRELoaded Modification

We need someone to modify our Basic CRELoaded oscommerce shopping cart where we can sell prepaid paid calling card pins. If you have done this in the past that will be great. Our needs are quite simple. Admin side: When we add a product we should also be able to load either one or 100 9 digit pin number and assosciated with that product number. We should have the ability to load pins using using a text file. For Catalog Side: When a customer place the order they will get (digital pins) via email depending on however many they purchase. For new customers they will not get auto pins since we will need to verify their payment. However repeat customer should be able to receive pins immediatley. As pins are sold under a product sold pins will become inactive "Red". Additional information will be provided.