Hello, Thank you for reaching out to Constant Contact API Developer Support. You can find our complete V3 API documentation at https://v3.developer.constantcontact.com/ and if you are upgrading from our V1 API, I would recommend beginning with the Getting Started guide that starts at https://v3.developer.constantcontact.com/api_guide/index.html
Please let me know if you have any other questions! Regards, David Bornstein Tier II API Support Engineer
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