Hello Oscar,
My name is Caleb and I am a member of Constant Contact's API Developer Support Team.
The error message that you are receiving appears to be a 404 error message which is caused when one of the requested 'campaign_ids' are invalid. In order for a 'campaign_id' to be valid, the campaign must have been sent prior to making the request as campaigns in the draft status will result in a 404 error message.
Another possibility is that the request you are using is miss-formatted which can also result in the system returning a 404 error message. Please be sure that your request is formatted with the {campaign_id} portion of the request URL being replaced with the appropriate campaign_ids you are requesting. For example your request should be formatted as:
- https://api.cc.email/v3/reports/stats/email_campaigns/1e63bc73-74c1-4046-bcb4-e8b1173b8af4
If you are still receiving an error message when making this request please be sure to send us an email at 'webservices@constantcontact.com' with the request, the response, the error message, any timestamps available, as well as any other information you believe may be useful in helping troubleshoot this issue.
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