default Map<String, String> getAdditionalUrlParameters(
      DataVertical dataType, AuthMode mode, OAuth1Step step) {
    return Collections.emptyMap();
  }
Return a map of parameters that will be added to the OAuth request.

<p>The OAuth 1 spec allows service-defined parameters on the request token and authorization
URLs. Typically this is used for token scope, but may have additional uses as well.

<p>Some services require different parameters (scopes) for different data types. The minimum
privilege for the given mode (EXPORT, IMPORT) should be used.
libraries/auth/src/main/java/org/datatransferproject/auth/OAuth1Config.java