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Why is my card-reader displaying 'ENTER REF'?

Why is my card-reader displaying 'ENTER REF'?

If your card-reader displays the message 'ENTER REF' you have pressed the card-readers' Sign button by mistake.

Please remove your card from the reader and start the process again. When the card-reader displays the message 'SELECT FUNCTION', ensure you press the Respond button, the one with two arrows on it.

Image of Respond button

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