Galactic Vouchers is a simple to use and highly efficient voucher plugin. You're able to log all actions to ensure players aren't able to cheat your system.

Commands

/voucher give player voucher (Gives player a voucher)
/voucher list (Shows all vouchers in a gui)
/voucher log

Dependecies

GalacticLib: https://www.spigotmc.org/resources/...run-any-of-the-galactic-series-plugins.93953/

MassiveCore: https://www.spigotmc.org/resources/1901/ (View a player's voucher logs)