ISO 8601 local datetime in the tenant's timezone.
Example:"2026-01-01T12:05:30"
{ "appointment_id": 0, "current_class_size": 0, "max_class_size": 0, "app_time": "2026-01-01T12:05:30", "column_number": 0, "item_id": 0, "item_group_id": 0, "appointment_type_id": 0, "practitioner_id": 0, "business_id": 0, "profession_id": 0, "width": 0, "duration": 0, "resource_ids": [ 0 ], "practitioner_name": "string" }