Since I know manage user IDs, then when a user logs out and logs in with a new user, then I will have two users with unique IDs but the same idfv/gpsAdId. What should I do? They might be the same user logging in or creating a user through a different login, but they also might be a completely new user.
What should I do?
Question
New users have previous user idfv
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+6Hey
Thank you for reaching out!
Given that you’re using custom App User IDs to identify your users, you should continue to use their unique identifiers to identify them. I would recommend using the IDFV only for attribution, not to identify the user. To add more context, RevenueCat’s IDFV is provided directly by the device, and we have no control over changing it for different App User IDs.
If you’re providing the user with multiple ways to sign in/sign up for your app and would like to prevent the same user from having multiple IDs, you may need to handle this on your backend and assign the same App User ID when you detect the same user (if possible).
From a purchase standpoint, if user A made a purchase and user B logs in and restores purchases, the purchase will get transferred to User B, as long as the same App Store/Google Play Account is configured in the device settings.
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