Mobile payments

Since I don’t drive this is probably old hat to everyone but I noticed that Tower Hamlets were taking payment by (presumably mobile) phone to pay for parking for those drivers that don’t have change.
Parking meter - Tower Hamlets
In reality it is phone up and give them your credit card details, but the process is crying out to be simplified. A nice Oystercard reader on the front perhaps?
Parking meter - Tower Hamlets