Set up a small EverShop catalog and place a test order with a product variant, discount, tax, shipping, payment, cancellation, and refund. Verify totals and state changes in both the customer view and admin view. Test inventory after the return.
A store is more than a product page. Confirm local tax and payment requirements, email delivery, data export, and backup recovery before opening to customers. A successful demo checkout is only the first step of a reliable commerce operation.
Akousa