Individual travelers can pay for their public transit at the end of the month, instead of needing to have money on their transit card and paying at the end of every trip.
The new service, NS Flex, applies to all forms of public transport - trains, bus, tram, and subway, RTL Nieuws.
Travelers can sign up for NS Flex through the NS site and will then receive a bill for their trips at the end of the month.
Read the complete article at https://nltimes.nl/2018/09/03/ns-introduces-public-transit-service-pay-end-month