Hello everyone, I would like to modify the affiliate codes and links of WHMCS。How to achieve it

[centos777]

WHMCS generates a unique code for each affiliate to use on their website. For example:

https://www.example.com/*?aff=001

After modification:

https://www.example.com/*?aff=(abc+123)          Random combination of letters and numbers：  
 

I tried using a hook, but was unsuccessful. thank you