Automatic Donator System for DarkRP

Suuuuuup People!

I need a bit help for a project for DarkRP. I want to make a donator system so then people have donated they’ll get a activation code. That code will count for some time, and when the time is out the person will be un-ranked. It should work with eather ULX or Evolve. Doesn’t matter. Does anyone know any tutorials in something like this, please post them! Or if someone would be so friendly to offer some help on steam I would be more than happy!

Remember to mind your good language!