This API closes the Merchant and consumer sessions (where applicable) and provides a payment identifier and, if requested, the card details required to successfully process the Payment transaction.If both Merchant and consumer sessions have timed out without receiving a valid input, Complete should not be invoked. If it is invoked, Merchants will receive a 422 Not Found error.The Merchant must incorporate a card-on-file consent check into their own digital property if they intend to use that functionality in Complete. Card networks handle card-on-file functionality in different ways. Refer to individual card networks' documentation for clarification and the most up-to-date guidance. Visa allows Merchants or their payment service providers to perform a token-for-token swap with a previous payment token. This means that, if the transaction type is BOTH, the dynamic data for CARD_ON_FILE will be identical to the dynamic data for PURCHASE. Mastercard has separate tokenization protocols for purchases and cards-on-file. This means that, if the transaction type is BOTH, the dynamic data will vary and need to be handled differently between PURCHASE and CARD_ON_FILE use cases. Discover does not support card-on-file functionality. Only PURCHASE is supported for Discover cards.