The P+R season ticket is offered by Q-Park. You pay season ticket fees to park in a single P+R location of your choice. You always have a parking spot in your chosen P+R.
If you have an NS Flex season ticket, you can park in any P+R location. You will also receive a travellers discount if you have used your OV-chipkaart to travel via public transport. And the parking fees will be deducted from your account at the end of the month via direct debit. You can find your parking history on your NS Flex invoice.