From PhpCOIN Documentation
Orders are a record of what you have sold to a client, or what a client has ordered from you.
Orders can be created manually by an administrator, or automatically when a surfer orders something on your website.
At the end of the surfer-ordering process, phpCOIN will display a PayLink so the surfer can pay you. A PayLink could take the user to PayPal or a similar site for payment processing, or it could take them to a form on your site for collecting credit card info, or even just show them where to snail-mail a payment ~ whatever you need.
In phpCOIN v1, each order can be only for one item due to legacy PayLink issues.
The admin parameter to disable orders will remove all menu links and buttons that reference orders, and if a surfer tries to access the order form directly via URL parameters they will receive a "disabled" notice.