Hi, I'm implementing an auto renew subscription in my app. I tried to figure out how to validate and get notified about any changes in users subscription status, and I found so much ways to do it. What is the difference between those: a. /validateReceipt b. appstore API (for example inApps/v1/history/{originalTransactionId}) c. apple notifications service, with the webhook url in the appstore connect information. Do I need to use all of the above methods in order to make my auto renew subscriptions 100% hermetic?

Hi. I'm using the apple API to validate the originalTransactionId I'm getting from the client. I also want to use the expireDate that comes from the last transaction. Can I trust the fact that the first element in the lastTransactions is actually the last transaction?