ObjectiveLuhn

Validates credit card numbers with a single method call like [Luhn validateString:], requiring no special formatting, as demonstrated in the README examples.

Identifies credit card types such as Visa or Amex using methods like creditCardType, adding useful context for payment forms without extra dependencies.

Extends NSString with a category method isValidCreditCardNumber, enabling validation directly on strings without additional imports, simplifying code integration.

Comes with unit tests and valid credit card numbers from sources like PayPal, ensuring reliability and easy testing for payment workflows.