code: public static ExitUrls of(String completionUrl, String rejectionUrl, String errorUrl) {
          return new ExitUrls(completionUrl, rejectionUrl, errorUrl);
      }
docs: Specify the urls the user is will be redirected to for different
  outcomes of a signing ceremony. When the user is redirected, the urls will
  have an appended query parameter ({@link StatusReference#STATUS_QUERY_TOKEN_PARAM_NAME})
  which contains a token required to {@link DirectClient#getStatus(StatusReference) query for the status of the job}.
  
  @param completionUrl the user will be redirected to this url after having successfully signed the document.
  @param rejectionUrl the user will be redirected to this url if actively rejecting to sign the document.
  @param errorUrl the user will be redirected to this url if any unexpected error happens during the signing ceremony.