What are the key takeaways from this guide?

Use any future expiration date, any 3-digit CVC (or 4-digit for Amex), and any postal code.. PayPal provides sandbox buyer accounts with pre-configured balances.. All valid card numbers pass the Luhn check — a checksum algorithm that catches typos:. Never use real card numbers in test environments** — even your own.

Who is this guide for?

This guide is designed for beginner-level users and takes about 1 minutes to read.

How-To Beginner 1 min read 293 words

Test Credit Card Number Generation for Payment Testing

Payment gateways provide specific test card numbers for development and testing. Using the correct test numbers ensures your checkout flow works without charging real cards.

Key Takeaways

Use any future expiration date, any 3-digit CVC (or 4-digit for Amex), and any postal code.
PayPal provides sandbox buyer accounts with pre-configured balances.
All valid card numbers pass the Luhn check — a checksum algorithm that catches typos:
Never use real card numbers in test environments** — even your own

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Stripe Test Card Numbers

Card Number	Brand	Behavior
4242 4242 4242 4242	Visa	Success
5555 5555 5555 4444	Mastercard	Success
3782 822463 10005	Amex	Success
4000 0000 0000 0002	Visa	Decline (generic)
4000 0000 0000 9995	Visa	Decline (insufficient funds)
4000 0025 0000 3155	Visa	Requires 3D Secure

Use any future expiration date, any 3-digit CVC (or 4-digit for Amex), and any postal code.

PayPal Sandbox

PayPal provides sandbox buyer accounts with pre-configured balances. Log into the PayPal Developer Dashboard to create sandbox accounts with specific currencies and limits.

The Luhn Algorithm

All valid card numbers pass the Luhn check — a checksum algorithm that catches typos:

Starting from the rightmost digit, double every second digit
If doubling produces a number > 9, subtract 9
Sum all digits
If the total is divisible by 10, the number is valid

Test card generators produce Luhn-valid numbers that pass frontend validation but are recognized as test numbers by the payment gateway.

Card Brand Detection

Brand	Starts With	Length
Visa	4	16
Mastercard	51-55, 2221-2720	16
Amex	34, 37	15
Discover	6011, 65	16

Important Warnings

Never use real card numbers in test environments — even your own
Test mode API keys process test cards only; live keys process real charges
Log test transactions separately from production
Always test both success and failure paths — declined cards, expired cards, and 3D Secure challenges