Its the same rules as contactless credit card payments by most banks here: after every 5 transactions you need to verify, everyone not larger than 30€ and the s

Its the same rules as contactless credit card payments by most banks here: after every 5 transactions you need to verify, everyone not larger than 30€ and the sum of these 5 transactions may not exceed 100€. If your next spending will break these rules you need to verify it