Hello user8189955,
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.
The response body: {"error_key":"access_denied","error_message":" Request forbidden due to account status"} indicates that the account that you are making the API call to has been canceled or disabled. You would want to have those specific clients verify the status of their Constant Contact accounts.
Please have a look and let us know if you have any other questions!
You can also reach our team directly/securely via email at webservices@constantcontact.com
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