List service account API keys

{
  "apiKeys": [
    {
      "id": "string",
      "serviceUserID": "string",
      "key": "string",
      "expiresAt": "2019-08-24T14:15:22Z",
      "createdAt": "2019-08-24T14:15:22Z",
      "lastUsedAt": "2019-08-24T14:15:22Z"
    }
  ]
}

{
  "error": "string"
}

{
  "error": "string"
}

{
  "error": "string"
}