We need to transfer an App to other developer account, both the account are belong to our company.
As we know, our app is using the Sign in with Apple function that we need to do some transfer job and we refer to this document: https://developer.apple.com/documentation/technotes/tn3159-migrating-sign-in-with-apple-users-for-an-app-transfer.
There is a lot of users using the Sign in with Apple in our app, totally serval millions. To avoid risks as much as possible that we have to make the work flow very clearly, so we're seeking help here.
I have serval questions, some I've got the answers from Google gemini and this Forums, I will list them below, please take a look what I understanding is correct or not, thanks.
A. From the document above, can I performed the Steps 1&2 before the app transfer? if so, is there a maximum lead time for these transfer_subs?
B. Regarding Step 5(Team B exchanging transfer identifiers via https://appleid.apple.com/auth/usermigrationinfo) are there specific rate limits (requests per second/minute) for this endpoint? Cause we have a huge number of user whose using the Sign in with Apple, we have to transfer the sub values as soon as possible.
C. Cause we have a huge number of user whose using the Sign in with Apple again, This transfer job involves huge risks. So, is there any way to simulate these whole operations?
Answer by my self: NO.