Adding unique product PIN number

I need a help or suggestion from anyone who has come across such an issue. I have a shop which sells telephone calling cards and I need to add the different value cards to the shop and maintain the EPIN numbers for each card. Say there might be 100 10$ calling card. But 100 unique EPIN numbers. Is there some module in zen-cart that I could use to add the EPIN numbers and send them out in the email as they are sold out. I hope you understand what exactly I'm looking for.
Thanks in advance.

You might find this helpful: http://www.zen-cart.com/forum/showthread.php?t=69666

actually let me explain my problem. Im trying to sell Phone Calling Cards And I have some categories of cards and say a quantity of 100 for each product. Now as u knw, each card would have a EPIN number and tat wud need to be mailed to the customer who buys these cards. So its like I need to store these set of numbers for each card and wen mail sent out to each customer, the number needs to be sent out on confirmation of the order. Is there a module or contribution in zen cart that can be implemented or do i need to be writing custom code for the same. Please advice me on this. THanks

You'll have to write custom code to store your EPIN numbers, and extract them as needed.
The topic I pointed you to talks about doing that same sort of thing for software licenses. The concept is the same.

can u please help me on this question
http://www.zen-cart.com/forum/showthread.php?t=87852