is it possible to add a "Redemption Limit" to a data file in the data folder?

Example: say theres a category that we dont use generated random codes for Donation ranks and monetization stuff.

Free All Players Event Code:

"Crazy4Candy"

that has a redemption limit of 1 per player so for the month of october, people that enter it can redeem it one time, and not have to give each player a seprate code sincecant really keep track of new players that join also on the server.