Temporary perms

I am making a voucher plugin and want there to be able to have temporary ranks. How would I go with adding this feature

 

Explain more, what code do you want?

 

i want the task that is needed to make them expire @GodWeedZao

 

or how do i use the time() function relative to a countdown

 

If you are talking about "temporary ranks," use https://poggit.pmmp.io/p/TempRanks/0.6.9

 

i want to create a plugin instead of ranks its perms