code: public Response<AccessTokenDetails> refreshAccessToken(final String refreshToken) throws FreesoundClientException {
  		final RefreshOAuth2AccessTokenRequest tokenRequest =
  				new RefreshOAuth2AccessTokenRequest(clientId, clientSecret, refreshToken);
  
  		return executeQuery(tokenRequest);
  	}
docs: Retrieve a new OAuth2 access token using a refresh token.
  
  @param refreshToken The refresh token to present
  @return Details of the access token returned
  @throws FreesoundClientException Any exception thrown during call