2Checkout is a globally accepted payment processor that accepts Credit Cards, PayPal, and Debit Cards.
Bitpay is a payment processor for bitcoin, which also accepts a multitude of currencies.
CCAvenue is a payment processor for the Indian rupee.
Google Checkout is a payment gateway by Google.
PagSeguro is a payment processor for the Brazilian real.
PayPal Payments Standard is one of the most popular payment gateways in the world.
Payza is a globally-accepted payment processor.
Skrill (Formerly Moneybookers) is one of the worlds leading digital payment companies.