Thank you for reaching out to the API Support team here at Constant Contact.
Data pulled from Constant Contact using our API is only available through HTTP requests, and are not available as files accessible via FTP. Documentation for how our API response for each report is formatted can be found here: https://developer.constantcontact.com/docs/campaign-tracking/email-campaign-tracking-.html
You can find complete documentation for our API at https://developer.constantcontact.com/docs/developer-guides/supported-methods.html
Please let me know if you have any other questions!
Sincerely, David B. API Support Specialist
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