Shopify Payments lets Shopify users accept card payments without having to integrate third parties.
Authorize.Net is an online payment gateway enabling small to medium-sized online merchants to accept credit card and electronic check payments from websites and deposit funds automatically into their merchant bank account. This feature is ideal for merchants who take mail or telephone orders from their customers.
Dwolla is an online payment solution specifically designed for bank transfers. It consists of a flexible and easy-to-use suite of products that work with all US banks and credit unions, making it easy to build applications that facilitate bank transfers, manage customers, and instantly verify bank accounts.