Walk me through it.
Why do you have all these steps to pay at a supermarket?
When I am here in the UK, I wave my phone over the card reader, it goes "Pling!" and that's my stuff paid for.
Of course, it's different elsewhere.
When I am over in Austria, I wave my phone over the card reader, it goes "Pling!" and that's my stuff paid for, but this time in Euros, at the going exchange rate.