curl --request POST \
  --url https://api.voxworks.ai/api/v1/add-contacts-to-list/{list_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "contacts": [
    {
      "phone_number": "0429069971",
      "first_name": "John",
      "last_name": "Smith"
    }
  ]
}
'

{}