Hello EricV975 ,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
While it won’t return any errors if excluded, the offline_access scope is now required for returning refresh tokens with the new flow:
V3 OAuth2 - Create an Authorization Request
https://v3.developer.constantcontact.com/api_guide/server_flow.html#step-1-create-an-authorization-request
Please have a look and let us know if you have any other questions!
... View more