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Hello,   In order to insert the Constant Contact contactId into the body of an email, you would need to retrieve the contactId and then add it as a Custom Field within the contact in order to use it as part of a Dynamic Link. We don't currently offer a way to insert the contactId directly into an email campaign.   Bulk Activities - Export Contacts Endpoint https://v2.developer.constantcontact.com/docs/bulk_activities_api/bulk-activities-export-contacts.html   ... View more

I know this is a super old issue but I was running into the same problem. The v3 URL is different and is below:   https://idfed.constantcontact.com/as/token.oauth2   Take note to the URL above not ending in a forward slash. My issue was that I was using a forward slash:   https://idfed.constantcontact.com/as/token.oauth2/   The above URL was giving me a 404 error because of the forward slash. Be wary! ... View more