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Assigns the external system identifier to a booking created by an external system that does not have one yet.

POST 
/api/booking/:bookingId/external-system-id

Requires the CanAccessAdminApi permission, and the booking must belong to the authenticated user and have been created by an external system. The identifier can only be set once: the request fails if the booking already has an external system identifier, or if the provided value is already used by another non-cancelled booking.

Request​

Responses​

Updates the ExternalSystemId of a booking created by an external system