List purchased phone numbers

{
  "data": [
    {
      "id": "string",
      "phone_number": "string",
      "status": "purchasing",
      "provider": "string",
      "country": "string",
      "wa_phone_number_id": "string",
      "social_account_id": "string",
      "monthly_cost_cents": 0,
      "created_at": "2019-08-24T14:15:22Z"
    }
  ]
}

{
  "error": {
    "code": "string",
    "message": "string",
    "details": {
      "property1": null,
      "property2": null
    }
  }
}