A Developer's Guide to Stripe Test Cards and Test Mode

Stripe's test mode is more capable than most teams use it for — beyond a generic "successful payment" card, you can simulate declines, 3D Secure challenges, and specific failure codes.

The Cards Worth Memorizing

• 4242 4242 4242 4242 — always succeeds
• 4000 0000 0000 0002 — always declines (generic)
• 4000 0025 0000 3155 — requires 3D Secure authentication
• 4000 0000 0000 9995 — declines with insufficient_funds

Test Clocks for Subscription Testing

For billing logic, don't wait real days for a renewal to fire — Stripe's Test Clocks let you advance simulated time and trigger renewal, dunning, and cancellation events on demand.