Allows a Buyer to submit a selected Payment Agreement in order to complete a Transaction and check out with a Merchant.
Upon success, the updated Application details will be returned. Possible Application statuses include CANCELLED, NEEDS_ACTION, DENIED and CHECKOUT_COMPLETED. Any of these statuses will result in a 200 OK response - the client must check the status field in the response body. An application with status NEEDS_ACTION and statusCode 070201 indicates that the payment method was declined and the Buyer is allowed to retry Checkout with a new paymentMethodID.
Upon completed checkout, a Transaction record is generated for the Merchant and the Buyer's Checkout is now complete.