My customer's credit card expired but their renewal still processed?

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Recurly uses a process called continuous authority (if the member’s bank supports it). This allows us to bill expired cards by submitting a future expiration date. So, if the card expires and the bank reissues a new card with the same number, just a new expiration date, we can potentially continue to bill that card via continuous authority, assuming their bank supports it. Whereas if the card is canceled and reissued with a new number, continuous authority won’t work (since the card we’re storing is no longer valid.