How to make Merch Codes?

Hello Developers! I have a small problem. I don’t really know how to do something like merch codes. I want 75 and all of them are stored in a table/folder. Does anyone know how I can do this? (It should only be redeemable once in the entire world)

Thank you for any reply!

Datastores. Need I say more?
Once one is redeemed it saves a value saying, yup its redeemed.
If someone tries to redeem the code it checks if it is already redeemed.

You can store all codes in a single table that is saved to the datastore like this

local codes = {
"CODENAME" = true -- if true then its been redeemed, if false it hasnt.
"Frog" = false -- it hasnt been redeemed
}

-- then all you need to do is save this table in a datastore, when a player tries to redeem a code check this datastore  get the code they tried to redeem, if its false redeem it! If not dont. Pretty simple I think