Comment to OneSignal
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Chris here it is https://documentation.onesignal.com/docs/data-collected-by-the-onesignal-sdk
https://documentation.onesignal.com/docs/handling-personal-data
I discovered this a while back when i had an account with them, as i navigated their site i came across a section in which i saw my messages stored. I immediately removed my account and brought it up UNA's attention. :/