Event Attendees
Changes to Record Participants by ContactId with Marketing Event External Ids
post/marketing/marketing-events/2026-03/attendance/{externalEventId}/{subscriberState}/create
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api operation id
post-/marketing/marketing-events/2026-03/attendance/{externalEventId}/{subscriberState}/create_recordByContactIdsremoved and replaced withpost-/marketing/marketing-events/2026-03/attendance/{externalEventId}/{subscriberState}/create
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endpoint added
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