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Idempotency-Key
header when sending events.Idempotency-Key
header when sending transactional emails.description
to mailing list objects in the List mailing lists endpoint.isPublic
attribute to mailing list objects in the List mailing lists endpoint.addToAudience
parameter in the Send transactional email endpoint can add contacts to your audience.userId
.400 Bad Request
response if an unrecognized property was added to Contact endpoints.400 Bad Request
response.userId
can be used in a Send event request.