Changes to Trigger multiple events for subscriber

added the optional property issues to the response with the 401 status

added the optional property issues to the response with the 500 status

added the optional property retryable to the response with the 401 status

added the optional property retryable to the response with the 500 status

added the optional property events/items/duplicate to the response with the 200 status

added the optional property code to the response with the 401 status

added the optional property code to the response with the 500 status

the response property success became optional for the status 401

the response property success became optional for the status 500

the response property subscriber/email became nullable for the status 200

added the new optional request property events/items/eventId

added the new optional request property events/items/occurredAt

added the optional property events/items/sideEffectFailures to the response with the 200 status

added the optional property optIn to the response with the 200 status

added the new optional request property firstName

added the new optional request property lastName

added the new optional request property externalId

the request property email became optional