Now, my problem is that I don't really know how to count the clicks in a reliable, bot-filtered way. I.e. a way that I can feel confident in invoicing my customers according to the data. Currently, I am counting each click on each link but it does not know if it is a bot or not. I don't feel I can, or want, to program my own system for this but rather rely on an external service for it. What options do I have? Preferrably free.