Question 1

How do I integrate Monza with Rails for subscription validation?

Accepted Answer

Add the gem to your Gemfile, then use Monza::Receipt.verify with base64 receipt data and a shared secret. Implement periodic checks using is_subscription_active? to manage access in your controllers or background jobs.

Question 2

Is Monza better than the apple_receipt_validator gem?

Accepted Answer

Monza offers a more Rails-centric interface with helper methods for subscriptions, while apple_receipt_validator is more minimal. Choose Monza if you need built-in subscription status checks; otherwise, apple_receipt_validator might suffice for basic validation.

Question 3

How to test receipt validation with Monza in development?

Accepted Answer

Use Apple's sandbox environment by setting the shared secret and passing sandbox receipt data. Monza automatically handles environment detection, but ensure your test receipts are generated from the sandbox to avoid errors.

Question 4

What do I do if Monza returns an error status from Apple?

Accepted Answer

Check Apple's status codes (e.g., 21000-21010) to diagnose issues like invalid receipts or server problems. Monza exposes the original_json_response for debugging, but you'll need to implement retry or alert logic manually.

Question 5

Can Monza handle refunds or cancelled subscriptions automatically?

Accepted Answer

No, Monza only validates receipt data; it doesn't automatically detect refunds or cancellations. You must poll Apple's servers or use webhooks separately to update subscription status based on expiry dates.

Question 6

Is Monza actively maintained and compatible with latest iOS?

Accepted Answer

The README shows a Travis CI badge but no recent update notes. While it works with current Apple APIs, monitor GitHub for issues or forks, as changes to Apple's receipt format could require gem updates.

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