How do I hook into Capture form onPost event?
I found the answer in a bit of a clumsy way, but the capture plugin has two services, capture_forms and capture_submissions. The first deals with saving the forms within the CraftCMS admin, the latter is for dealing with the form submissions.

I had to simply change my listener to craft()-&gt;on('capture_submissions.onPost', function(Event $event){...}); and I can see the event data.