I am using a Groupbuyseotool service. In there I use tools like jasper, frase, shortlyai like tools. I subscribed for the plan in their web tools and to access those I have to access with the link provided in the dashboard.

When I click the link tool will be loaded in another tab. based on my payment and subscription plan removing tools from my account is possible.

Now here comes the techy part. They are able to keep track of how much usage I am doing with each tool. for eg: On shortlyai if I generate 100 words, from the dashboard at groupbuytools it shows that I used 100 words.

How they are doing this. I inspect the browser. I check thorugh session variables, indexed DBs and everything. I cleared the cache. I tried ignito windows. How are they tracking it? As a developer, I would like to know how they keep tracking of these things even on the original service providers' site?