Place the charm flat on the reader as shown on the image below, ensure that the charm is placed in the centre of the reader. Observe the display and sound from the devices for clear indication that the transaction is successfully completed before entering or exiting the area.
Avoid placing any item near the charm or between the reader and the charm that may interfere with the transaction. If the reader is unable to detect the charm, simply move the charm around the reader’s area and avoid the metal keychain from being in contact with the reader.