Let the http address go to https

If an old link still uses http, the visitor enters by the door without the lock.

That door should point at the locked address. Without the redirect, two addresses wander around.

What it is for A certificate has an end date too. When it ends, the lock drops and the page warns. Renewal sits inside the hosting account.

How it sits A certificate works for the domain it was written for. It does not clip onto another name. A subdomain must be named on the certificate too.

Where it breaks Let the http address go to https. SSL is the lock in the browser. The address opens with https. On a page without the lock the visitor sees a warning and leaves the form.

What to do A certificate binds to the domain it was written for. Payment ends on the Stripe page. The card number does not sit on this site.