As apple mention that it tries to collect payment up-to 60 days if a user has billing issue. Does enabling grace period for my apps changes anything regarding collecting payment or it's just used to reduce involuntary churns?
What's the difference between Grace period enabled or disabled?
Check out our public documentation around billing grace period. This generally is great for subscribers and great for your service as you reduce lost billable days by providing a grace period where service is not interrupted. https://developer.apple.com/documentation/storekit/in-app_purchase/original_api_for_in-app_purchase/subscriptions_and_offers/reducing_involuntary_subscriber_churn#3379448