Additional Checkout Attributes (a.k.a. Magento order attributes) is a Magento extension that allows store owners to add custom fields to the checkout page. It is intended for for merchants dealing in products which require diverse information from customers in order to complete checkout process. It supports text, date, checkbox, and radio button inputs. It works with one-step checkout, has easy one click installation, and allows fields to be added to different products individually, as a group, or for all products.