Test Cards Reference

Provide a quick reference for Stripe test card numbers:

If a scenario argument is provided (e.g., "declined", "3dsecure", "fraud"), show relevant test cards for that scenario
Otherwise, show the most common test cards organized by category:
- Successful payment (default card)
- 3D Secure authentication required
- Generic decline
- Specific decline reasons (insufficient_funds, lost_card, etc.)
For each card, display:
- Card number (formatted with spaces)
- Expected behavior
- Expiry/CVC info (any future date and any 3-digit CVC)
Use clear visual indicators (✓ for success, ⚠️ for auth required, ✗ for decline)
Mention that these only work in test mode
Provide link to full testing documentation: https://docs.stripe.com/testing.md

If the user is currently working on test code, offer to generate test cases using these cards.