Disclaimer: I am not the original author of this plugin, i just fixed it so it's compatible with 1.21 version of Minecraft. Original author is Teenaapje.
Original version of this plugin is: Click Here




How to use this plugin:
- Download it
- Throw it into Plugins folder
- Download PlaceholderAPI
- Throw it into Plugins folder
- Start your server
- Check if it loaded properly using /plugins
if it did you will need to follow several other steps now
you will need to type /Papi ecloud download Player this command
will load Player placeholders which you will need for plugin to work
after it loads reload both plugins or restart the server

Permission:
- Referral.ReferPlayer - /ref <name> - Tell the server who invited this person
- Referral.RefReject- /ref reject <name>
- Referral.RefAccept - /ref accept <name>
- Referral.RefCount - /ref total
- Referral.RefTop - /ref top
- no perm - /ref help

Admin
- Referral.Reject - /ref reload
- Referral.RefAdmin - /ref Admin ['Reset', 'Remove'] <name>

Commands:
/ref <player> - Referrals a players and gives rewards
/ref Total - checks self or /ref Total <player> - For other players
/ref Accept <player> - Or click the button
/ref Reject <player> - Or click the button
/ref Help - Shows list of commands the player can use
In older versions of the plugin <player> used to be <Player>!
Admin
/ref Reload - reloads the plugin
/ref Admin ['reset', 'remove'] <player> - Resets or removes the player from the database
In older versions of the plugin <player> used to be <Player>!


PlaceHolders:
%referral_total% - Gives the referral total of the player
%referral_refed% - Tells if the player refed

You can use placeholders in places where already is a placeholder.