We had AMEX text notifications come in late Boxing Day evening, 450+ for John Lewis Direct, Harvey Nichols Beauty Bazaar and Spotify. Talked to AMEX almost as soon as they came in--seems as though the transactions were approved even though I had not put the codes into an online entry point. Also got email notifications although I don't recall ever receiving those by email before. AMEX shut the card down but they seem to have some weak points in the security scheme that aren't holding up very well.