code: public AuthorizeUrlBuilder authorizeUrl(String redirectUri) {
          Asserts.assertValidUrl(redirectUri, "redirect uri");
  
          return AuthorizeUrlBuilder.newInstance(baseUrl, clientId, redirectUri);
      }
docs: Creates an instance of the {@link AuthorizeUrlBuilder} with the given redirect url.
  i.e.:
  <pre>
  {@code
  AuthAPI auth = new AuthAPI("me.auth0.com", "B3c6RYhk1v9SbIJcRIOwu62gIUGsnze", "2679NfkaBn62e6w5E8zNEzjr-yWfkaBne");
  String url = auth.authorizeUrl("https://me.auth0.com/callback")
  .withConnection("facebook")
  .withAudience("https://api.me.auth0.com/users")
  .withScope("openid contacts")
  .withState("my-custom-state")
  .build();
  }
  </pre>
  
  @param redirectUri the redirect_uri value to set, white-listed in the Application settings. Must be already URL Encoded.
  @return a new instance of the {@link AuthorizeUrlBuilder} to configure.