Create an acces token.

Hello everyone, I am trying to create a token to can work with my API for get information about links from box in Node Js, so I understand that I need to use the config.json for create the authentication:

  "boxAppSettings": {
    "clientID": "************************************",
    "clientSecret": "********************************",
    "appAuth": {
      "publicKeyID": "",
      "privateKey": "",
      "passphrase": ""
    }
  },
  "enterpriseID": "455328"
}

But I want to know if all this fields are required or if I just need use some fields of these for create the token.