How does Honey extension capture data?

I am using Honey and going through their FAQ and in below link it is mentioned that they collect some data from shopping website and if user made a purchase or not. I want to know if if Honey is capturing cart data and how do they do it? Through data scraping on checkout/payment page? and how does it know that is purchase happen or not? FAQ Link: https://help.joinhoney.com/article/29-what-information-does-honey-collect