foo.txt

securitySchemes:
    - oauth_2_0:
        description: |
            Dropbox supports OAuth 2.0 for authenticating all API requests.
        type: OAuth 2.0
        describedBy:
            headers:
                Authorization:
                    description: |
                       Used to send a valid OAuth 2 access token. Do not use
                       with the "access_token" query string parameter.
                    type: string
            queryParameters:
                access_token:
                    description: |
                       Used to send a valid OAuth 2 access token. Do not use together with
                       the "Authorization" header
                    type: string
            responses:
                401:
                    description: |
                        Bad or expired token. This can happen if the user or Dropbox
                        revoked or expired an access token. To fix, you should re-
                        authenticate the user.
                403:
                    description: |
                        Bad OAuth request (wrong consumer key, bad nonce, expired
                        timestamp...). Unfortunately, re-authenticating the user won't help here.
        settings:
          authorizationUri: https://www.dropbox.com/1/oauth2/authorize
          accessTokenUri: https://api.dropbox.com/1/oauth2/token
          authorizationGrants: [ authorization_code, refresh_token ]
```