Event: card.issued
Sent when a new card has been successfully issued for a cardholder.
On card programs that provision asynchronously, POST /partner/cards returns immediately with "status": "pending" and this event fires later — once the card has been fully provisioned and transitioned to active. Treat this event (not the issue response) as the signal that the card is ready to use. Sandbox reproduces the same sequence after a short delay.