Having just flown home last evening, the receipt is already available. Timely!
However, it shows that they charged me for the drink that (as MVP Gold) is supposed to be complimentary. So there you go....using a paper receipt, I could have at least looked and corrected the situation there.
[Yes, I know most flight attendants look at their device and greet you by name, but when you're sitting in 6C I assumed she knew I was a FF]