PhoneGap Plug-in Methods I am developing with Ionic 3.Curious on the
official description pagePhonegap plugin, part of ID Service MethodsThe
first question:visitorSyncIdentifiers,
visitorSyncIdentifiersWithAuthenticationState,
visitorSyncIdentifierWithTypeThese three methods are "Synchronizes the
provided identifiers with the ID Service."Which method is better, the
difference between these three methods?The second
question:visitorGetIDs, this method, the value I took out is null, is
this normal?...