Ways to integrate › Invoice your customers with Checkout
Issuing invoices and collecting payments securely through Google Checkout is as simple as sending an email. You don't need integration or programming knowledge and you still get all the benefits of easy transaction processing at no cost to you.
How it works
To send email invoices
Sign up for Google Checkout, and then click 'Send an invoice' under the 'Tools' tab. Sending email invoices requires no technical or programming knowledge.
For more information, including step-by-step instructions, see the Developer Guide.