Make sure you have turned on contactless payment and take your card out of your wallet when checking in and out.
You can check in and out with the following payment methods:
A contactless debit card from ABN AMRO, ASN Bank, bunq, ING, Rabobank, RegioBank or SNS
A contactless credit card from Mastercard and Visa (issued by ICS, among others)
A contactless debit or credit card from Maestro, V PAY, Mastercard or Visa
Mobile & wearable linked to your account

Pre-registration is not necessary. Make sure you have enough balance on your account or spending limit on your credit card.