IOS APPLE MOBILE UPDATE

I need to update my mobile application on apple ios to the new standards required by the apple store or to offer account deletion in your app. using the Apple REST API to revoke user tokens. The second update of the application is to change the data source from a new db always present on the main server. The source codes of the application in ios updated to two years ago will be provided.
(https://developer.apple.com/support/offering-account-deletion-in-your-app)