Retrieves real-time information for a customer's active linked or virtual cards, including card number, CVV, expiry date, and card type.

Supports optional filtering by card ID or card type.
Important considerations:

• Only returns information for active linked or virtual cards.
• If no active cards are found, an error is returned.
• Response times may vary since real-time queries are made to the card provider.
• Customer must have at least one active linked or virtual card.
• card_id is optional; if provided, only that card's information is returned.
• Response includes card number, CVV, expiry date, and card type for each active card.