Ionic notification migration

i’m using ionic v1 ionic push notification. so i did associated the device token to Ionic User. For v2, i’m required to migrate our Ionic User to beta. Actually i just need the device token for push notification to particular .“User Id” may i know, if i’m do not use the ionic user service where does the device token store? because i can’t find from

the documentation stated :
"When saving device tokens, we automatically associate the token with any authenticated & current Ionic.User. If you do not use the Ionic User service, this will still save the device token as normal, but will not be associated with any particular user"