Ebay can leverage your ecommerce business using your own brand name example that i just read in forbes is http://shopedropoff.com the website design simple and elegant website then redirect the website into ebay page this the owner to leverage the ebay traffic website. Aside from that the branded ebay is more trusted than the website http://shopedropoff.com. This is perfect example to leveraging portal gateway for your business to get more traffic. Also give time to get well organized content and high quality pictures to get the customer attracted on the design. Photos that you design must also be in real design once the client buy online.
The portal gateway is always been the paypal. To received the money faster. Usually paypal transaction to receive the money is 2 to 4 days depend on your geographical location.