I would like to sell items from my shopify store and issue the customers a code to open the combination lock (i.e. 10-24-17). I think it will just require some simple scripts. 

Also, not sure if I have multiple identical items inside the box how I can generate different combination codes for each door, so I don't have to re-enter a new product for each code. I am not asking for a random code generator, just a way that if I have one product with ten items in stock, that I don't have to re-enter the product 10 times to account for the different combo codes. X