I'm currently transferring an iOS app to a new Apple Developer account and following the process outlined in Apple’s documentation:
🔗 TN3159 - Migrating Sign in with Apple users for an app transfer
The process for generating transfer_identifiers and migrating existing users is clear, and I don’t expect issues with that part.
However, I have a question about preserving the user session after the transfer.
My setup:
The app uses Sign in with Apple via a backend-based authentication flow.
On login, the app retrieves the authorization_code and sends it to the backend.
The backend exchanges the code for tokens from Apple, including a refresh_token.
That refresh_token is then used on the backend to validate the user’s identity on subsequent requests.
My concern:
Once I initiate the app transfer, migrate users, and update the backend with new Apple credentials (client ID, team ID, etc.), I assume that the existing tokens issued under the old credentials will become invalid.
So my question is:
Is there a way to maintain the user’s authenticated session through this transition without requiring them to manually sign in again?
I’d like to ensure a seamless experience for users, if possible.
