It looks like CC doesn't plan to support true machine to machine (non-interactive) authentication which completely boggles my mind why they would make that choice. It is a massive limitation for us and many others I see posting online. https://community.constantcontact.com/t5/API-Developer-Support/Authentication-for-non-user-interactive-integrations/td-p/360706/page/2
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If you post to their board or reach out to them through their site, make sure to include the context that you are developers and already have the form made, you just need to connect with our API.
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