### Answer I don't have specific guidance from Retell AI documentation on whether clients should use their own Cal.com/Zapier accounts or whether you (as a builder/agency) should use yours. This is more of a business/operational decision rather than a technical requirement. From a technical standpoint, the integrations require: - **Cal.com**: An API key from Cal.com (found in Settings → Developer → API Keys) and an Event Type ID [(1) ]() [(2) ]() - **Zapier**: An API key from your Retell AI dashboard under Settings > API Keys [(3) ]() The accounts used will determine whose calendars get booked and whose workflows get triggered, so consider: - Who manages the calendar/availability? - Who needs access to booking data? - Who handles the automation workflows? Would you like a general answer on best practices for agency vs. client account ownership?

​ To learn more, see the sources I considered: [[1] Error validating call.com tools](https://community.retellai.com/t/error-validating-call-com-tools/394) [[2] Error when using booking functions](https://community.retellai.com/t/error-when-using-booking-functions/337) [[3] Connect AI call agent to zapier](https://www.retellai.com/integrations/zapier) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.