GoAffPro provides you with the option to set an affiliate's referral code.
To set an affiliate's referral code, go to the All Affiliates section in the Affiliates tab of the GoAffPro admin panel.
Here, click on the affiliate's name.
This will open up the affiliate's profile.
Now, click on Customize in the Referral Link section.
This will open up the Customize Referral Link window.
Here, edit the referral code.
Now, click on Submit.
Finally, the newly set referral code will appear in the referral link of the affiliate.