catch (\Stripe\Exception\CardException $e) echo "Card declined: " . $e->getMessage();

?>

The industry standard for basic validation is the (Mod 10). It detects accidental errors or typos without contacting a bank. The logic works as follows:

Safer alternatives and recommended approaches

The first step of any "best" checker is local validation. This prevents unnecessary API calls for typos or fake numbers. : Validates the checksum digit of the card number.

Secure implementation practices

: Validates the checksum digit to ensure the number sequence is mathematically possible. BIN/IIN Identification

$pan = sanitize_pan($raw_pan); if ($pan === '') http_response_code(400); echo json_encode(['error' => 'No PAN provided']); exit;

The following example demonstrates the most important part of this process: creating a PaymentIntent with a minimal amount:

: Strip whitespaces and non-numeric characters before processing to prevent errors.

: Never store raw CVV or CVV2 numbers under any circumstances.

. For professional use, it often integrates with payment gateways like Core Functionality of a CC Checker