From 31 January 2023, travellers will be able to check in and out at Dutch gates (passage barriers) with their (mobile) debit card via the new OVpay system of Dutch Railways NS, if contactless payment is possible. However, this innovation may result in an erroneous debit of € 20 when passing through the gates. Especially if travellers want to use their rail ticket to pass through the gates.

To avoid this, if you have a bank card stored on your mobile phone, it is best to use a printed ticket (not a screenshot of the ticket barcode) to open the gates. 
You can use an Android mobile phone as soon as NFC is deactivated; unfortunately, this function does not exist for iPhones. In this case, please contact the Dutch Railways NS staff at the gates.

If you have been debited € 20 by OVpay, you can get this amount refunded at https://reisoverzicht.ovpay.nl/. These debits can be identified by the code NLOVxxxxxx on your billing statement.