Sarah was flying without me last week & told me about the following (without me asking... which I thought was odd of her): The person next to her ordered a drink & paid with a CO something card. The receipt showed the full price and the customer disputed it with the FA, who said she couldn't do anything but the customer would have to call Chase to figure it out later. The pax suggested that the FA just give them a second bottle and "call it even", to which the FA happily obliged. I wonder if the FA got a bottle from the F cabin to make it 'even' in the paperwork.