Apple Pay is on its way to the UK next month, and from launch, all the big banksexcept Barclays, and a quarter of a million retail outlets will support it. And yet, despite so many day-one partners, it seems we're not quite ready for it. You see, Apple Pay isn't like any other contactless payment method we use already, since you authorise transactions with a Touch ID fingerprint scan. Contactless debit and credit cards don't require any kind of authentication, which is why transactions are currently limited to a maximum of 20, though the cap is increasing to 30 in September. The whole point of the two-step Apple Pay process is that you can make purchases of any amount using your iPhone, but today we're hearing that the majority of retailers will be bound by the 20 cap at launch.