Deletes a specific appointment by ID
curl --request DELETE \
--url https://api.example.com/v4/appointment/{appointmentId} \
--header 'x-meetergo-api-user-id: <api-key>'curl --request DELETE \
--url https://api.example.com/v4/appointment/{appointmentId} \
--header 'x-meetergo-api-user-id: <api-key>'