Use a random string generator for an alphanumeric code.
Based on your request, it seems you are looking for information on how to or create (make) a redeem code, likely for a Google Play account or mobile game. How to Buy a Redeem Code
Type the code and ensure there are no spaces or dashes, as this can cause errors. How to Create a Redeem Code (For Sellers/Creators)
If you are creating, I can explain how to set up promotion rules.
You can purchase digital Google Play codes via Prepaid24 or instantly via Krgkart .