@Override
public AccessGrant verifyResponse(final Map<String, String> requestParams,
final String methodType) throws Exception {
LOG.info("Verifying the authentication response from provider");
if (!providerState) {
throw new ProviderStateException();
}
if (requestToken == null) {
throw new SocialAuthException("Request token is null");
}
String verifier = requestParams.get(Constants.OAUTH_VERIFIER);