Good morning, I want to connect Vapi with Go High Level using only API, It will just make some calls for a selected list and then if any appointment is scheduled through the phone call I need it to appear on the calendar can someone help me how can I do it?

Use Vapi to call contacts from a list, handle appointment booking in the call flow, and send appointment data via GoHighLevel’s API to appear on the calendar, ensuring it properly authenticated and integrated..

Is there is any refrence I can follow step by step?

There is no reference which you can directly follow instead it's a pretty simple process where you have to integrate things step by step. Search forGHL Automations, they are webhooks, and then you can get it done. Let me know if you further help.