We received a request directly from /apple/notifications. This subscription is not a renewal, but a first-time purchase. We associate the originalTransactionId with the user's ID to identify the subscribed user. However, since we do not have access to the user's ID on our server through this direct request, we are unable to properly process the subscription.
How should we handle this type of subscription request? What is the source of this subscription, and why are some users able to bypass in-app purchases for first-time subscriptions and make the purchase directly?