This sounds like what happens with Hotels.com where the hotel you just booked with said there was an issue with the payment that was submitted, and you must pay with this alternate payment method instead -- it turns out the hotel's account had been compromised and the thief/scumbag/scammer does this to all the hotel's bookings. The one we got a message from, apparently the respective hotel keeps having this happen over and over. My guess is the outdated computer they use has a keylogger or trojan on it and their accounts will just be forever compromised. Fun times.
Some posts about this:
https://www.bbc.com/news/technology-67583486
https://perception-point.io/blog/booking-com-customers-hit-b... (same thing happening to booking.com)
https://old.reddit.com/r/travel/comments/19dk51w/bookingcom_...