Best Way to Implement Affiliate Link Tracking in CodeIgniter 4?

This is interesting to me because I want to rebuild in CI4 a tool I threw together with plain PHP (years ago), not specifically for affiliate purposes but more generally for click tracking. What I have now is, frankly, terrible - thus my desire to rebuild it from the ground up without breaking existing links. Current tool doesn't handle bot traffic at all, so anything I add in that regard will be an improvement. However, I don't know best practices for that, so this is something I will need to learn as well.

1) Clicks on each referral link
    Use CodeIgniter Events for tracking referrals, you may also need to use
    CodeIgniter's _remap to check the referral links.

Intriguing; I was not aware of Events. More to learn...