* <li>LOGIN_PARAMETERS - The parameters to include in the login request.</li>
 * </ul>
 *
 */
public class Hc4FormScheme implements AuthScheme {

    private static final Logger logger = LogManager.getLogger(Hc4FormScheme.class);

    private static final String ENCODING = "encoding";

    private static final String TOKEN_URL = "token_url";

        final List<Pair<Hc4FormScheme, Credentials>> formSchemeList = new ArrayList<>();
        for (final Hc4Authentication authentication : siteCredentialList) {
            final AuthScheme authScheme = authentication.getAuthScheme();
            if (authScheme instanceof Hc4FormScheme) {
                formSchemeList.add(new Pair<>((Hc4FormScheme) authScheme, authentication.getCredentials()));
            } else {

                AuthScheme hc5AuthScheme = null;
                final org.apache.http.auth.AuthScheme hc4AuthScheme = hc4Auth.getAuthScheme();
                if (hc4AuthScheme instanceof Hc4FormScheme) {
                    hc5AuthScheme = convertFormScheme((Hc4FormScheme) hc4AuthScheme);
                }

                result.add(new Hc5Authentication(hc5Scope, hc5Creds, hc5AuthScheme));
            } catch (final Exception e) {