As its name suggest, procedure to check out is only one combined step. Instead of completing six complicated steps as in the past, all you need to do is filling in your address and choosing your payment methods on the same page. Data fields are also effectively updated via AJAX. Never before check out be easier and faster. Magento One page checkout supports most of the popular payment gateways such as : Paypal, Moneybooker, Sagepay, 2Checkout,… Furthermore, the displayed layout changes from 2 columns to 3 columns, and the style color also changes on the backend. With cart installed, your customers can add related products to cart and select all required options directly on the checkout page.