Use this API retrieve a list of email addresses that opened a sent email campaign.
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Privileges required: contacts:read
Retrieves a list of email addresses that opened the email campaign specified by
campaignId path parameter (REQUIRED). Use the
created_since query parameter to retrieve only those opens that occurred on or after the date/time specified. This is useful for sync'ing tracking data across applications.
NOTE: Tracking information is only available for SENT email campaigns.