A Java library for generating mathematically-valid credit card numbers for software testing. The API provides customizable criteria for generation, and is extensible to apply to any payment card type which uses Luhn validation (not limited to just credit cards).

A small guide on credit card security, and ways hackers exploit them

An API that validates card numbers and returns json data with status and issuing network

Calculate the check digit(mod10 algorithm)

Create or validate a Lühn (mod 10) check digit in a numeric string in Go.

The Luhn algorithm

Decode and verify Swiss QR-Bill