In message , at 12:28:45 on Tue, 18 Dec
2018, Graeme Wall remarked:

This whole thread is going off at cross purposes. When the adverts
say you can take smartphone payments without a machine, they mean one
of those DECT-phone sized dedicated machines with a thermal printer
(hold that thought).

The offering is a cardreader that plugs into a smartphone.
But how does one print a receipt??

email.

Yet another example of externalising costs to the consumer, and
gathering data (email address) for someone the hack into.
--
Roland Perry