I'm afraid I must disagree! Last week I touched in on a standalone reader at Hackney Wick with my contactless bank card (well, phone) (the barriers were open and not functioning); seeing that the next train to stratford was not due for another 25 minutes due to a few cancellations, my partner and I decided to take an Uber instead. I waited for 2 minutes, and then touched out on the very same reader. Today whilst reviewing my travel history, I found that I had been charged a maximum fare of £6.40. Both touches were registered on my TfL account, and it was stated that a max fare had been charged. Given no option to refute this, I inputted an incomplete journey to Stratford in order to get the majority of the charge refunded. I wish I'd taken screenshots now! £4.50 refund literally came through half an hour ago!