Allow people to purchase gift certificates with a code that can be applied directly to the booking. When they buy a gift certificate, we ask a few questions: the amount, the recipient's information, and a gift certificate is emailed with a unique code that is used directly when booking. The certificate is tax-free at the time of purchase but taxable at the time of booking. You'd be surprised how many sales you lose annually with these certificates. We circumvent the payment system in other ways, but it's not useful.