I do have a "custom field" at which a user enters a URL to his website.
Now I would like to change this URL and include my "Affiliate ID" towards the URL.
But I would like to have my "Affiliate ID" not being visible at the URL-string.
My Affiliate URL:
The URL which should be visible to the user:
Literally not showing the real full URL to the user.
It should be only possible for "Admin" to be able to change the URL in this way.