If you’re not sure what data (events and attributes specifically) you’re currently sending to Customer.io and how it’s being used, the Data Index is where to find it. In the left-hand menu, it’s found just below activity:
Here, you’ll find all of the attributes and events flowing into your Customer.io account via your chosen integration method. You can see:
Here’s a quick gif of how to dig into a specific event:
Head over to the Data Index introduction for more details on how to navigate; otherwise, feel free to explore!