Checkout.php template file
From Shopp Documentation
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The checkout.php template provides the checkout form used for standard transaction processing using payment gateway modules. The layout and order of the fields may be completely customized in this template.
It is important to note that removing some of the fields currently on the checkout form can cripple the checkout process and keep it from working properly.
The remote checkout payment gateways (such as PayPal Express and Google Checkout) bypass the checkout form provided by this template, and instead use checkout forms that their payment service hosts.
The checkout.php template primarily uses Checkout Tags.
