JUMP TOOverviewQuick Start API GuideREST API OverviewRate LimitsIdempotent notification requestsMessagesCreate messagePush notificationpostEmailpostSMSpostTransactional MessagesView MessagegetView Message Response ObjectView MessagesgetCancel MessagedeleteMessage HistorypostLive ActivitiesStart Live ActivitypostUpdate Live ActivitypostUserCreate userpostView usergetUpdate userpatchDelete userdeleteView user identitygetView user identity (by subscription)getCreate aliaspatchCreate alias (by subscription)patchDelete aliasdeleteSubscriptionsCreate subscription (by alias)postUpdate subscriptionpatchDelete subscriptiondeleteTransfer subscriptionpatchUnsubscribe email (with token)postTemplatesCreate templatepostUpdate templatepatchView templatesgetView templategetDelete templatedeleteCopy template to another apppostSegmentsView segmentsgetCreate segmentpostDelete segmentdeleteConfigurationView appsgetView an appgetCreate an apppostUpdate an appputAnalyticsView OutcomesgetExport Subscriptions CSVpostExport Audience Activity CSVpostDeprecatedView devicesgetView devicegetAdd a devicepostEdit deviceputEdit tags with external user idputDelete Player RecorddeleteView Messageget https://api.onesignal.com/notifications/{notification_id}?app_id={app_id}View the details of a single message and the Outcomes associated with it.