I try to use this add ons but some problem found.
For example, I add 4 codes to 1 product (xbox card).
The first time, I buy 2cards. The card will be show is the 1st, and the 2nd.
Then, I try to buy the second times 3 cards. It showns the 1st, 2nd, and the 3rd.
=> The cards arer not remove from the database. I dont know how to fix it.
The other, I offer the ownner encrypted the cards from admin module.
128Kb encryption of pin numbers (pins are encrypted while there are being stored in the database). It will be better.