How to add unique ID’s in each link

Hi,
I’m using this plugin with the Custom Post Type UI plugin. I’m providing IT services on my website related to the IT. Now I started an affiliate program to increase my sales. I have generated the affiliate links for each service. So when I share this link with different companies or marketing platforms, how would I know the user comes from which platform?

To do this I need to add a unique ID for every company so I can give them a commission for each buy.

Also, let me know how can I track this thing to check the user IDs in the WP Dashboard.