Using Commerce you can showcase and sell your products using PayPal account. Simply drag and drop this element and you can enlist and edit your products.
You can add new products that you want to sell using your PayPal account. Just click 'New Product' under Commerce tab and simply add the product image, title, description and price. You can also customize the layout style, button type. At any point if you feel like you should change the image or duplicate the product to add similar type of product with different specifications, you can do that by clicking various option in the tool box.
Your online store where you enlist the products that you want to sell using your PayPal account.