What Gateways Should Our App Support?

We have a shopping cart and I would like to know thoughts on which payment gateways we should support.

Right Now we have:

Google Check Out

What are the market leaders in Gateways?

PayPal & Google Checkout are standard payment gateway & market leader (most use), just go with these two.
you can also try Authorize.net but it bit expensive.

Actually PayPal and Google checkout only make up about 10% to 12% of our online sales.

This question is being asked from the perspective of a shopping cart developer NOT an online store.

Just add whatever gateways your clients need. Make a request form on your website or something.

Generally speaking, there’s www.creditcardprocessing.org

Also, if you make a clean and easy API, other developers will do the dirty work for you :slight_smile: