Web integration with donations

I’m wondering if there’s any free or not overly expensive web integration scripts or similar which enable me to have a website with lots of buttons, that do 2 things, let you donate a fixed amount, and in return, runs a rcon command on my gmod server.
I would want things like…

Button that says Low Gravity [$5]
$10 to set the server to low gravity for 5 minutes

A rank
$10, you get given a rank etc

and a few more things that are similar. Is it overly complicated to integrate it like this? or should I just hire someone to do it?

(I have searched and viewed many tutorials)

https://scriptfodder.com/scripts/search/donation/
If you wan’t free ones, then you need to search the internetz yourself and try to fixx them up.