Earlier quoted context omitted.
At least in the UK, contactless is limited to 20£ and probably has other limits as well I suspect.
£30 currently. Though mobile payments don’t fall foul of this in theory, in practice some terminals are limited to £30 to match the card limit, which can be annoying when you want to pay by mobile (the most secure way).
I believe Apple Pay supports payments >£30 but I use Android Pay and it has never allowed me to exceed £30. I understand that it is probably a limitation of the terminal in many cases but I have observed an Apple Pay transation exceed £30 and then been rejected by my Android Pay device on the same terminal in one case.