トークンのダウンスコープ

curl -X POST https://api.box.com/oauth2/token \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "subject_token=YOUR_ACCESS_TOKEN" \
  -d "subject_token_type=urn:ietf:params:oauth:token-type:access_token" \
  -d "grant_type=urn:ietf:params:oauth:grant-type:token-exchange" \
  -d "scope=item_upload" \
  -d "resource=https://api.box.com/2.0/folders/FOLDER_ID"

{
  "access_token": "1!DgsZ6V9kMWZu2StrxwQDF5BudQNen-xUmU2cfcVKArE....",
  "expires_in": 4175,
  "token_type": "bearer",
  "restricted_to": [
    {
      "scope": "item_preview",
      "object": {
        "type": "folder",
        "id": "1234567890",
        "sequence_id": "0",
        "etag": "0",
        "name": "Test"
      }
    }
  ],
  "issued_token_type": "urn:ietf:params:oauth:token-type:access_token"
}