How can we improve WHMCS?

As an affiliate marketer and owner of a VPS comparison platform (https://cloudvps.by/) I work with many hosting providers using WHMCS. One challenge I face is the inability to track the performance of different marketing channels (e.g., social media, blogs, email campaigns) when promoting affiliate links. Currently, WHMCS affiliate links redirect to the homepage, product, or cart, but they lack support for UTM parameters, which are essential for modern analytics.

I propose adding a feature that allows affiliates to generate custom affiliate links with UTM parameters (utm_source, utm_medium, utm_campaign, etc.) directly in the Client Area. For example:

Standard link:   https://example.com/aff.php?aff=123&pid=456
Custom link:   https://example.com/aff.php?aff=123&pid=456&utm_source=facebook&utm_medium=cpc&utm_campaign=summer_sale

This could be implemented by:

Adding a "Generate Custom Link" option in the Affiliates section of the Client Area.
Allowing affiliates to input UTM parameters via a simple form.
Saving generated links for reuse.

This feature would:

Help affiliates track campaign performance in tools like Google Analytics.
Enable providers to gain insights into traffic sources and optimize their affiliate programs.
Increase conversions by supporting more targeted marketing.

This is a simple yet powerful enhancement that would make WHMCS’s affiliate system more competitive and valuable for both affiliates and providers. Thank you for considering this idea!