Card number

Sometimes, your customer might enter a cancelled, non-issued or invalid card number in the Payment Form.

A card number is validated through the following steps:

• A card token is created.
• The card number field values are used, excluding any non-numeric characters.
• The remaining digits are processed by using the Luhn algorithm.

Passing the remaining digits of the credit card through the Luhn algorithm does not prove the validation but helps prevent typing errors.