[freebeard]

https://en.wikipedia.org/wiki/QR_code_payment

QR code payment is a contactless payment method where payment is performed by scanning a QR code from a mobile app.[1] This is an alternative to doing electronic funds transfer at point of sale using a payment terminal.[2] This avoids a lot of the infrastructure traditionally associated with electronic payments such as payment cards, payment networks, payment terminal and merchant accounts.

To use a QR code payment the consumers scans the QR code displayed by the merchant with their phones to pay for their goods.[3] They enter the amount they have to pay and finally submit.[3] This is a more secure card-not-present method than others.[3]

I'm being dragged, kicking and screaming: wikipedia.org/wiki/Android_(operating_system)#Scope_of_surveillance_b y_public_institutions