For a while I actually tried doing something like this -- the coupon page included jQuery, so a quick one-liner self-XSS clicking the right elements would itera

For a while I actually tried doing something like this -- the coupon page included jQuery, so a quick one-liner self-XSS clicking the right elements would iterate through all the pagination, and then you could call the click handler on all the Add buttons (which share a CSS class for styling). The problem came at checkout -- whenever I typed in my phone number (to apply the coupons from the loyalty account), the point-of-sale system would hang for tens of seconds while loading and then trying to apply all those coupons.