curl --request POST \
  --url https://api.{tenant}.getomneo.com/api/v3/appointment-definitions/{appointmentDefinition}/locations \
  --header 'Content-Type: application/json' \
  --data '
{
  "location_id": 123,
  "is_active": true
}
'

{
  "data": {
    "id": 123,
    "appointment_definition_id": 123,
    "location_id": 123,
    "is_active": true,
    "location": {
      "id": "<string>",
      "name": "<string>",
      "handle": "<string>"
    },
    "created_at": "<string>",
    "updated_at": "<string>"
  }
}