Hi. I'm trying to create variables to send out to my server for usage billing of my assistant. My billing company says we need customer_id, user_id and minutes_used gathered when a user accesses my assistant. How do I create and get the data to my server? Support sent me this but not sure how to proceed. any help is greatly appreciated: For individual customers, the data is not displayed on the dashboard. However, you can access all the necessary information using the customer number and the Vapi API call ID. Please help!