/api/registrations
Retrieves a list of all registrations (requires admin access).
/api/registrations/event/:eventId
Get all registrations for a specific event (requires login & event organizer access).
/api/registrations/:id
Get details of a specific registration.
/api/registrations
Register for an event.
/api/registrations/:id/checkin
Update check-in status of a registration.
/api/registrations/:id/payment
Update payment status of a registration.
/api/registrations/:id
Delete a registration.
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