Yet another thing going the way of everything. Just about every Playbill we own is accompanied by the corresponding ticket stub, obsessively tucked three-to-four pages before the back cover. Where do we put the URL?
No one is stopping you from printing it out and sticking it in your playbill, if that's what you still want to do. At this point, you might want to be grateful that playbills aren't entirely digital... yet.