I need to generate an absolute URL that will use the secure HTTP protocol since it's a payment page template used by a third party payment gateway solution that requires every single element on the page to point to or to come from an HTTPS link. Now, I can't for the life of me find how to use the Twig url() function to generate a secure URL. Anything you add to the function in an array is considered a GET parameter that will be appended at the end of the URL in a ?x=y manner.
How can I generate an HTTPS URL using the Twig url() function?