Re: gratuity and tip
I added a tip capability to a client's takeout site a few months ago, and it seems to work well. I did it by creating a new order_total module (ot_tip), adding a field for the tip on the checkout_payment page, and in the header_php.php file of the checkout_confirmation page the customer-entered value for the tip was stored as a session variable that is picked up and used by the ot_tip order total module. The sort order for the tip module was set so it gets added after the subtotal and tax...
Neville
An assumption is what you arrive at when you get tired of thinking...