Is a free lock enough

A valid lock for one domain is enough for a shop page.

More than one name, and a check that is required, is a separate job. Which you need is written on the TechNest security shelf.

What it is for 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.

How it sits The certificate closes the path between you and the visitor. It does not store the card number with you. The payment page is separate.

Where it breaks Is a free lock enough. A certificate has an end date too. When it ends, the lock drops and the page warns. Renewal sits inside the hosting account.

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.