When we are designing E-Commerce sites, we usually need some payment icons. So that we can clearly tell our clients which payment methods we accept.

Web Icon Set is very kind to release a set of Payment Icon Set for free. Payment Icon Set includes VISA Card, Master Card, American Express, Cirrus, PayPal, Cash Payment, Gold Coin, Gold Coin Stacks, Secure Payment, Shopping Cart. They are free for both personal and commercial projects.

Requirements: -
Demo: http://www.webiconset.com/payment-icon-set/
License: License Free