No, I probably wasn't very clear in the original post. More like a video chat service with billing built-in. Code Mentor allows you to have a video chat with somebody and it handles the payment depending on how long you were talking. I'm looking for a generic version of this (that isn't particularly geared toward coding/programming)

We run a video consultation platform (https://www.coviu.com/) and you can activate a stripe integration to create appointment bookings with associated stripe payments (activate the "Client Payments" addon from https://coviu.com/addons). People can't enter the video call without having paid. You might want to check out if that solves your problem.