I want to integrate with StoreKit 2 in my app but still use the old App Store Server notifications. Will there be any issues with this?
Can I use StoreKit 2 client side and still use V1 App Store Server notifications?
Yes. tho you will find Version 2 notifications also use JWS and the transaction info is simpler and aligned with StoreKit 2. Plus version 2 notifications only send the single relevant transaction for the notification.