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
Use a random string generator for an alphanumeric code.
Are you asking how to for yourself, or are you trying to create a code to give to someone else?
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)