See https://meta.discourse.org/t/whiltelisted-discourse-app-with-push-notifications-via-onesignal/58247
mentioned: 1 replied: 2 quoted: 3 edited: 4 liked: 5 private_message: 6 invited_to_private_message: 7 invitee_accepted: 8 posted: 9 moved_post: 10 linked: 11 granted_badge: 12 invited_to_topic: 13 custom: 14 group_mentioned: 15 group_message_summary: 16 watching_first_post: 17 topic_reminder: 18 liked_consolidated: 19 post_approved: 20 code_review_commit_approved: 21 membership_request_accepted: 22