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I needed an API to report on individual campaigns, and since there wasn't one, I've written one.
It works just like the other Sendy APIs, with the API key. It returns total sent, total opens, unique opens and country data.
You need to supply the API with the brand_id and the label for the individual campaign.
The code is on this Gist and you're welcome to it (and welcome to grab and use this code in future versions of Sendy).
I hope this is helpful and useful for someone.
Thanks for sharing James!