My understanding is that if this is the first subscription payment, or the first payment since the subscription was last updated, and it fails, then I will receive the net.authorize.customer.subscription.suspended notification.

But what if its not the first payment, or first since update?  What if month 1 goes through but month 2 fails (happens all the time!).  Is it correct that the ONLY way to detect this is via email or silent post?

How should this be handled?