Astrid
2
There’s a lot on github!
https://github.com/reboot13-git/cc-checker
https://www.connect-trojan.net/2018/01/cc-checker-source-code-vb.net-by-x-slayer.html
CC Checker Source Code [PHP]
https://anonymousfiles.io/QfJQnsu5/
Extras
https://medium.com/hootsuite-engineering/a-comprehensive-guide-to-validating-and-formatting-credit-cards-b9fa63ec7863