A digital product's Licence keys page takes keys pasted one per line, or a text file of keys, for each option. Each unit sold gets one unused key, shown on the customer's order page, in their confirmation email and on the order in Store. An option's stock is its number of unused keys, so it is sold out when they run out. Keys are stored encrypted.
Licence keys for digital products
Add licence keys to a digital product, and each unit sold gets one key on the customer's order and in their confirmation email.