Why might a customer be declined when using a migrated card?

When a card is migrated, it is essential that all necessary details for a successful transaction are correctly transferred and submitted during the authorization process. The CVC (Card Verification Code) or CVV (Card Verification Value) serves as an additional layer of security to verify that the person using the card is in physical possession of it at the time of the transaction. If the CVC or CVV was not included during the first authorization request for a migrated card, the transaction may be declined due to security protocols.

Payment processors like Stripe often require these security codes to prevent fraudulent transactions. If the authorization fails for not including this crucial information, it can lead to a decline that does not relate to the card's validity, expiration, or any other issues that might normally lead to a decline. Hence, understanding the importance of including the CVC/CVV during transactions involving migrated cards is vital for successfully processing payments.