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Instead of a user name and password, Access Tokens are the credentials used to represent the authenticated user to the Box servers.

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Token Object

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OAuth 2.0 authentication

When an Access Token is requested using OAuth 2.0, an Access Token and Refresh Token pair are returned. 
curl -X POST https://api.box.com/oauth2/token \
    -H "content-type: application/x-www-form-urlencoded" \
    -d '...'

{
  "access_token": "c3FIOG9vSGV4VHo4QzAyg5T1JvNnJoZ3ExaVNyQWw6WjRsanRKZG5lQk9qUE1BVQ",
  "expires_in": 3600,
  "token_type": "bearer",
  "refresh_token": "c3FIOG9vSGV4VHo4QzAyg5T1JvNnJoZ3ExaVNyQWw6WjRsanRKZG5lQk9qUE1BVQ",
  "issued_token_type": "urn:ietf:params:oauth:token-type:access_token"
}
Within this object we can see the token string (access_token), as well as the Refresh Token (refresh_token) that can be used to request a new Access Token when the current one expires (expires_in).

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Server authentication

When an Access Token is requested using JWT or Client Credentials Grant, only an Access Token is returned: 
curl --location --request POST 'https://api.box.com/oauth2/token' \
    --header 'Content-Type: application/x-www-form-urlencoded' \
    --data-urlencode '...'

{
  "access_token": "DkXZmsjUKizvL2z0WiaLvMBeQ756XCGGf",
  "expires_in": 4123,
  "restricted_to": [],
  "issued_token_type": "bearer"
}
Within this object we can see the token string (access_token). Because a Refresh Token is not returned, you must request a new token when the Access Token expires (expires_in) using the token endpoint.