I am also having trouble connecting my client's Constant Contact account with his DIVI Email Optin module. I've used both the v2 and v3 tools mentioned above to generate keys and tokens, and when I enter them, they seem to be accepted... however my client's email contact list does not show up in the drop-down menu. I'm stumped... seems to be a very difficult and problematic integration. MailChimp is much easier! I don't know what to do at this point.
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