CARD_LEFT_IN_READER
A card can only be used for one transaction, and must be removed after being read. Otherwise, subsequent collectPaymentMethod
attempts will fail with this error.
Your MobileReaderListener implementation will receive ReaderListenable.onReportReaderEvent with ReaderEvent.CARD_REMOVED when the card is removed.
The Chipper 2x and WisePad 3 will beep until the card is removed.