Parking is a booking business with its own quirks. Inventory is a facility rather than a seat, rates depend on arrival and departure times rather than a simple date, and fulfilment is a pass or barcode that has to work when the driver arrives at the gate.
Integrating a parking marketplace means handling all three correctly: finding the right facility for a location or event, quoting a rate for a real time window, and reliably delivering something the customer can actually use. It is a natural companion to event ticketing, where parking is often the attachment sale.