Payment Icon Set is a set with 18 payment icons in PNG format, in the resolutions 32×32px — 128×128px. This set was designed by Phil Matthews and released especially for Smashing Magazine and its readers. So you can download Payment Icon Set from Smashing Magazine, it is free to use in private and commercial projects — no credit is required.
The icons are inteded to be used on e-commerce websites where you can show what types of payment the shop accepts. Each icon comes in curved and straight edge variations.
From the designer, Phil Mathews:
This icon pack includes 18 different payment icons in PNG format. These icons are released free of charge and can be used without credit. The icons cannot be resold in any way. The copyright of each logo is owned by the respective payment company and I do not take responsibility for any part of the design of these. They are inteded for you to show what types of payment your website accepts. Please spread the word if you like this icon set or find it useful. Thank you.
— Phil Mathews