Adds or updates a user avatar.
The access token received from the authorization server in the OAuth 2.0 flow.
The ID of the user.
The image file to be uploaded to Box.
Accepted file extensions are .jpg or .png.
The maximum file size is 1MB.
ok: Returns the pic_urls object with URLs to existing
user avatars that were updated.
A resource holding URLs to the avatar uploaded to a Box application.
Represents an object with user avatar URLs.