You could wrap up speed and convenience in a way that people will notice.  You could have restaurant, bar, or room service menus with scancodes.  Your customer can just scan the code and touch the 'confirm payment' button that appears on his phone, to order and pay for an item in one step.  Done.  No waiting for waitstaff, no need to call roomservice, no mistranscribed orders, no messing about with the bill, etc. 

Likewise any 'extras' that the hotel might provide as convenience services, such as hair salon or spa appointments, dry cleaning or laundry, conference rooms, A/V equipment, stay extensions, and the thousand other things in your hotel service directory -- Scan once, and done. 

I can even picture the hotel pushing the 'convenience payment' for services outside of the hotel itself; for example cut a deal with a cab company that allows them to put some predefined scancodes into your hotel's service directory.  Then, if someone wants a cab to the airport/downtown, they can pay for it the same way they pay for things in the hotel itself, and it's absolutely seamless as far as the customer is concerned. 

Or, you know, they could use that old-fashioned phone number thing, go through the hassle of talking to a human, then go through later hassle of getting out their wallet and paying for the ride in a separate step, etc....  that's in the service directory too, but it's a pain in the ass by comparison, right?