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.
In order to use the GET an Email Forwards Report endpoint, you would first need to set up your application/integration to use one of our available OAuth2 authorization flows. Once you have obtained an Access token, you’ll include it in the authorization header for the GET an Email Forwards Report. Below I’m including documentation on our available OAuth2 authorization flows as well as the GET an Email Forwards Report request.
GET an Email Forwards Report:
Please have a look and let us know if you have any other questions!
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