Keeping same user across multiple devices
Noob, sorry. This should be easy to find, but not having any luck finding.
Step 1: If a user installs my app on their phone and then on their tablet, how do I know it's the same user without having to create a login. Same if they switch devices.
Step 2: A user goes to the web version, can I know it's the same user again or do I need to have them create a login (either through SM or a UN/PW)? This I can find examples, but don't like forcing users to enter that stuff.
I know step 1 works without anything extra from the user on Android from my experience, but my IOS knowledge is very limited.
Device ID is what I keep finding to track a user, but that doesn't sound like it would work in this situation. Can't find anything about an App store ID which is how I would expect this to work. The actual data isn't an issue, just need a common user ID.
Thanks ahead of time.