Hi


There is nothing directly in the access token that will let you derive the enterprise ID. I think your best bet is to use the users/me endpoint

https://api.box.com/2.0/users/me?fields=enterprise should return something like

{


    "type": "user",


    "id": "13110169300",


    "enterprise": {


        "type": "enterprise",


        "id": "57767591",


        "name": "Peter's Demo Account"


    }


}