How do I add this to my site?

[TrentS]

i want to make it so if people use a certain link to my site they get a cut of the money the person used on the site. How do I add this?

 

[Turtle]

i want to make it so if people use a certain link to my site they get a cut of the money the person used on the site. How do I add this?

referral system

 

[Christopher]

i want to make it so if people use a certain link to my site they get a cut of the money the person used on the site. How do I add this?

What Payment system are you using?

 

[TrentS]

referral system

How do I add that

 

[AtlasA858]

How do I add that

Is there any particular billing panel you are using or is this a custom built site?