Get appointment

{  "data": {    "add_to_calendar_url": "https://book.acme.com/c/appointments/appt_a1b2c3d4e5f6/add_to_calendar",    "cancel_url": "https://book.acme.com/c/appointments/appt_a1b2c3d4e5f6/cancel",    "cancellation": {      "allowed": true,      "disabled_message": null    },    "confirmed_at": "2025-03-10T15:30:00Z",    "end_at": {      "local": "2025-03-01T11:00:00-05:00",      "object": "zoned_date_time",      "time_zone": "America/New_York",      "unix_ts": 1736464800,      "utc": "2025-03-01T04:00:00Z"    },    "ics_url": "https://book.acme.com/c/appointments/appt_a1b2c3d4e5f6/ics",    "id": "appt_a1b2c3d4e5f6",    "object": "public_appointment",    "reschedule_url": "https://book.acme.com/c/appointments/appt_a1b2c3d4e5f6/reschedule",    "rescheduling": {      "allowed": false,      "disabled_message": "Rescheduling is not available within 24 hours of your appointment"    },    "start_at": {      "local": "2025-03-01T10:00:00-05:00",      "object": "zoned_date_time",      "time_zone": "America/New_York",      "unix_ts": 1736461200,      "utc": "2025-03-01T03:00:00Z"    },    "status": "scheduled",    "urls": {      "add_to_calendar": [        "https://book.acme.com/c/appointments/appt_a1b2c3d4e5f6/add_to_calendar"      ],      "add_to_google_calendar": [        "https://book.acme.com/c/appointments/appt_a1b2c3d4e5f6/add_to_google_calendar"      ],      "cancel": [        "https://book.acme.com/c/appointments/appt_a1b2c3d4e5f6/cancel"      ],      "ics": [        "https://book.acme.com/c/appointments/appt_a1b2c3d4e5f6/ics"      ],      "reschedule": [        "https://book.acme.com/c/appointments/appt_a1b2c3d4e5f6/reschedule"      ]    }  }}