I have a digital marketing and web design agency owner who is looking to get himself a voice agent that checks availability and books appointment + save every call with relevant information etc. in a Google Sheet. I have that AI voice Agent and Automation ready. How much should I charge him based on monthly basis. AI agency owners, I would really appreciate your answers.

Can anybody tell me that where/how can I find the credential ID of my connected calendar in cal.com. I am facing a hard time facing it