expired_card
Expired card. The card's expiry date has passed. Stripe's card account updater often refreshes these automatically, but not every bank participates.
Will retrying the charge work?
No. The same card will keep failing. You need the customer to give you a new payment method.
What to do about it
Retrying the same card won't work. Ask the customer to enter their new card details. This is the single most recoverable decline when you email promptly.
What to tell your customer
The card on file has expired. Update your card details to keep your subscription active.