curl --request POST \
  --url https://api.cal.com/v2/bookings/{bookingUid}/decline \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: application/json' \
  --header 'cal-api-version: <cal-api-version>' \
  --data '
{
  "reason": "Host has to take another call"
}
'

{
  "status": "success",
  "data": {
    "id": 123,
    "uid": "booking_uid_123",
    "title": "Consultation",
    "description": "Learn how to integrate scheduling into marketplace.",
    "hosts": [
      {
        "id": 1,
        "name": "Jane Doe",
        "email": "[email protected]",
        "displayEmail": "[email protected]",
        "username": "jane100",
        "timeZone": "America/Los_Angeles"
      }
    ],
    "status": "accepted",
    "start": "2024-08-13T15:30:00Z",
    "end": "2024-08-13T16:30:00Z",
    "duration": 60,
    "eventTypeId": 50,
    "eventType": {
      "id": 1,
      "slug": "some-event"
    },
    "location": "https://example.com/meeting",
    "absentHost": true,
    "createdAt": "2024-08-13T15:30:00Z",
    "updatedAt": "2024-08-13T15:30:00Z",
    "attendees": [
      {
        "name": "John Doe",
        "email": "[email protected]",
        "displayEmail": "[email protected]",
        "timeZone": "America/New_York",
        "absent": false,
        "language": "en",
        "phoneNumber": "+1234567890"
      }
    ],
    "bookingFieldsResponses": {
      "customField": "customValue"
    },
    "cancellationReason": "User requested cancellation",
    "cancelledByEmail": "[email protected]",
    "reschedulingReason": "User rescheduled the event",
    "rescheduledByEmail": "[email protected]",
    "rescheduledFromUid": "previous_uid_123",
    "rescheduledToUid": "new_uid_456",
    "meetingUrl": "https://example.com/recurring-meeting",
    "metadata": {
      "key": "value"
    },
    "rating": 4,
    "icsUid": "ics_uid_123",
    "guests": [
      "[email protected]",
      "[email protected]"
    ]
  }
}