ios - Is it possible to get an ID from non-app friends that is reusable when they have the app? -


my problem want send user(in own backend system) who's not using app along invite. way when they've accepted invite, there's message user invited them in inbox.

but id can /me/taggablefriends , id /me/user_friends not same. 2 users can have same name is not unique.

so question there way can use identify user before installed app , after. have can reuse identify them again , make connection id /me/user_friends after installed app?


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