I'm on a product page ready to buy, so I click the "Add to basket" button
Added to basket
The products have been added to the basket. I now see "sponsored" products that are related to the purchase. I can edit the basket, or proceed to checkout. I go ahead and proceed to checkout.
On the checkout, I can see my default delivery address and payment options that have been previously saved. I can change the delivery method and I also see how much I'm saving by having a Prime account. To confirm the purchase, I click "Buy now"