code: public java.util.List<String> getGrantTokens() {
          if (grantTokens == null) {
              grantTokens = new com.ibm.cloud.objectstorage.internal.SdkInternalList<String>();
          }
          return grantTokens;
      }
docs: <p>
  A list of grant tokens.
  </p>
  <p>
  For more information, see <a
  href="http://docs.aws.amazon.com/kms/latest/developerguide/concepts.html#grant_token">Grant Tokens</a> in the
  <i>AWS Key Management Service Developer Guide</i>.
  </p>
  
  @return A list of grant tokens.</p>
  <p>
  For more information, see <a
  href="http://docs.aws.amazon.com/kms/latest/developerguide/concepts.html#grant_token">Grant Tokens</a> in
  the <i>AWS Key Management Service Developer Guide</i>.