Season tickets, on the plate
The people who park with you every day are the ones you least want to annoy. They are also the ones most likely to be carrying a plastic card from 2016 that has stopped working.

The plate is the ticket
A season ticket is attached to a number plate. The holder drives in and is recognised — nothing to present, nothing to top up, nothing to leave on the dashboard. If they change car, you change the plate.
The same is true when the ticket ends. Access stops on the date it stops, rather than whenever someone remembers to collect a card back.
What you can sell
Monthly and longer subscriptions
Recurring parking for commuters, residents and nearby businesses, priced however your site prices it.
Time-limited allocations
A ticket that covers certain hours or days — a weekday commuter rate that does not quietly become weekend parking.
Several plates on one agreement
A household with two cars, or a company that wants its own list of vehicles, without buying a ticket per plate.
Sold online, not at a desk
Subscriptions can be bought and managed online rather than by email and a spreadsheet.
Season tickets or contract parking?
They overlap, and the distinction is mostly about who you are selling to. A season ticket is bought by a person for their own car. Contract parking is an agreement with a business or a building for a block of spaces, managed as one arrangement with its own allocations and its own invoicing.
Most sites run both.
When a season ticket holder overstays
They are billed for the excess. They are not fined.
This is worth stating plainly because it is the thing that goes wrong elsewhere. Someone who pays you every month and then stays two hours past their allocation is a customer having an ordinary day, not an evader — and treating them as one costs far more than the two hours are worth.
The platform handles excess use as a billing matter. It never becomes an enforcement case, in a barrier-free site or a barriered one, which means it does not depend on an officer's judgement or on how the site is configured.
How many regulars do you have?
That, and how you sell to them today, is usually enough to tell whether this is a straightforward change for your site.