phpBoleto is a project aimed at creating
electronic invoices to be paid at Brazilian banks,
following a standard for account billables. It is
intended for Brazilian developers who want a free
alternative to credit card processing on
e-commerce sites and allows customers to pay the
invoices in a easy and secure way. It features a
wide array of options, such as creating invoices
in PDF, JPEG, GIF, PNG, SVG, and HTML, and an
ability to email invoices to the customer if he
wishes.