code: protected String getUserAuthorizationRedirectURL(ProtectedResourceDetails details, OAuthConsumerToken requestToken, String callbackURL) {
  		try {
  			String baseURL = details.getUserAuthorizationURL();
  			StringBuilder builder = new StringBuilder(baseURL);
  			char appendChar = baseURL.indexOf('?') < 0 ? '?' : '&';
  			builder.append(appendChar).append("oauth_token=");
  			builder.append(URLEncoder.encode(requestToken.getValue(), "UTF-8"));
  			if (!details.isUse10a()) {
  				builder.append('&').append("oauth_callback=");
  				builder.append(URLEncoder.encode(callbackURL, "UTF-8"));
  			}
  			return builder.toString();
  		}
  		catch (UnsupportedEncodingException e) {
  			throw new IllegalStateException(e);
  		}
  	}
docs: Get the URL to which to redirect the user for authorization of protected resources.
  
  @param details	  The resource for which to get the authorization url.
  @param requestToken The request token.
  @param callbackURL  The callback URL.
  @return The URL.