In the Sprout Forms plugin, is there a way to modify the EntryModel through sproutForms.onBeforeSaveEntry? I have a plugin that sends a cURL request onBeforeSaveEntry, and I'd like to grab the response from that and deliver it to the user on the thank you page.
I've tried setting new properties on the $event object but I'm getting errors, so maybe my approach is wrong? Been searching, but unable to find how to get it done.