There is one thing I don't quite understand when it comes to In-App Subscription purchase.
I obtain the receipt on iOS client like this:
private func loadReceipt() -> Data? {
guard let url = Bundle.main.appStoreReceiptURL else {
return nil
}
do {
let receipt = try Data(contentsOf: url)
return receipt
} catch {
print("Error loading receipt data: \(error.localizedDescription)")
return nil
}
}
And send it for verification to my server (written n Python).
def verify_receipt(self, receipt):
r = requests.post(config.APPLE_STORE_URL, json=receipt)
request_date_ms = DateUtils.generate_ms_from_current_time()
for item in r.json()['latest_receipt_info']:
expires_date_ms = int(item['expires_date_ms'])
if expires_date_ms > request_date_ms:
return True
return False
I'm not sure if this is the correct way of verifying if a subscription is still valid.
I get the expires_date_ms from latest_receipt_info, and if it's greater than the current time in milliseconds, then the subscription counts as still valid.
However what I noticed is that the separate latest_receipt, which is supposed to be equal to the one I have just sent in, is actually changing every time I call the API. But why? I haven't subscribed to anything new, why is the latest receipt changing?
According to the docs:
latest_receipt
Only returned for receipts containing auto-renewable subscriptions. For iOS 6 style transaction receipts, this is the base-64 encoded receipt for the most recent renewal. For iOS 7 style app receipts, this is the latest base-64 encoded app receipt.
