This feature allows you, to set custom link tracking code for each of your affiliates i.e. you can customize the tracking URL in order to make it more friendly.
Here is an example:
For your affiliate with ID 5 and email: [email protected]
you can set custom link code: "john".
Now the tracking link instead of looking like this:
will look like this:
both tracking links are working, so there is no need for the affiliate to change all of his already posted links.
You can set custom link tracking codes for only few affiliates, all of the others will keep their default links.