How to use fields in ASN Local receipts while evaluating iOS Auto-Renewable iAP?

Question

Our iOS App supports yearly subscriptions with different free trial periods. We are aiming to evaluate the receipts available locally on user's device offline.

**We are planning to do this: **

1. Check if cancellation_date exists - inactive subscription

2. If cancellation_date doesn’t exist, check if purchase_date exists:

   if yes, check if expires_date exists and is in an active period - active subscription

   if not, check if expires_date exists and is in an active period - may be trial period

The thing we cant figure out is, if user turns-off subscription in trial period stopping payment, how can the app know such events?

Does expires_date indicate "trial duration + 1 Year" or only "1 year"?

Does original_purchase_date or purchase_date indicate "start of trial" or "the date user has made payment"?

Note: We also plan to periodically refresh local receipt using SKReceiptRefreshRequest.

Answer 1

Make sure you are looking at the sub-contents of all the in_app entries, ASN1 type 17. There will be one for each renewal.

Cancellation date is only set if the subscription is cancelled by Apple customer service, you should mostly depend on the expiration date.

The trial is treated as separate in_app field in the in_apps array. So as long as you are looking for the latest expires_date field, you will be computing the correct expiration date.

Also, I'm not sure how up to date the in_apps are when using SKReceiptRefreshRequests. Apple says to use server side validation, and the /verifyReceipt endpoint when using subscriptions.

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