{
  "id": "string",
  "phone": "string",
  "name": "string",
  "email": "string",
  "tags": [
    "string"
  ],
  "groups": [
    "string"
  ],
  "opted_in": true,
  "created_at": "2019-08-24T14:15:22Z"
}

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

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