Checkout pages
From the toolbar, navigate to Store | Configuration | Checkout setting s.
There are three checkout pages initially defined. They are as follows:
Checkout: This is the main checkout page, which allows the customer to add their account and billing information. When we add more features to our store later on, more checkout panes will appear in the checkout page.
Review order: The final page before the payment is taken is referred to as the review order page. It gives the customer a final chance to see all of the order in one place before committing to buy. This is a legal requirement in some territories.
Checkout complete: This is a confirmation page displayed at the end of the order process informing the customer of their order number and displaying a thank you message.