Does anybody know how to generate Redemption codes for theme forest

Does anybody know sell webflow templates on theme forest?

I see other sellers on theme forest selling them no problem and i figured out how they do it but for some reason cannot figure out how they generate these redemption codes that the customer later puts into their account to get the theme into their webflow account.

All templates I custom made on webflow which is allowed to be sold but have no clue how to do it.

Any help is appreciated.