}
OAuthUtils.validateMessage(oAuthMessage, requestToken.getClient(), requestToken,
dataProvider);
AccessTokenRegistration reg = new AccessTokenRegistration();
reg.setRequestToken(requestToken);
AccessToken accessToken = dataProvider.createAccessToken(reg);
//create response
Map<String, Object> responseParams = new HashMap<String, Object>();
responseParams.put(OAuth.OAUTH_TOKEN, accessToken.getTokenKey());