protected String getCallbackUrl(final WebClient webClient, final HtmlPage authorizationPage) throws Exception {
webClient.waitForBackgroundJavaScript(5000);
HtmlForm form = authorizationPage.getForms().get(0);
final HtmlTextInput login = form.getInputByName("login_email");
login.setValueAttribute("testscribeup@gmail.com");
final HtmlPasswordInput passwd = form.getInputByName("login_password");
passwd.setValueAttribute("testpwdscribeup");
HtmlButton submit = form.getButtonByName("");
HtmlPage confirmPage = submit.click();
confirmPage = (HtmlPage) confirmPage.refresh();
webClient.waitForBackgroundJavaScript(5000);
form = confirmPage.getForms().get(0);