Vaulting is a secure way of storing credit card data so that it can be easily used for subsequent purchases. Vaulted payments are generally a “token” that the merchant stores which was generated by the payment gateway either on the initial order with that payment or when the customer added the payment method to the vault. This token can only be used for transactions from the merchant for that customer. Since there’s nothing specific to the actual payment information (e.g. the credit card number) in the token, it’s a secure way for the merchant to offer the convenience of stored payments for customers without having to worry about PCI compliance.