I couldn't find enough info to answer your question about how to find the Cal.com API link. I'm escalating this to a human teammate who can help you out! If you need info on how to set up API requests in Vapi workflows, you can check out the [API Request node docs](
https://docs.vapi.ai/workflows/nodes/api-request), but for the specific Cal.com link, someone from the team will get back to you soon.