This is only the source code of the job system. If you only want the JobSystem without source code, take a look at the following product: https://chunkfactory.com/product/jobssystem-mysql-mongodb-postgresql-api-vault-support-1-17-1-19.3282/
The jobs system offers the possibility that your players can get XP for e.g. killing animals, which they can use to increase their wages. The interval at which wages are paid can of course be set in a...