PaymentCard is used to charge the cost of goods or services to
an account, belonging to the party identified on the card.PaymentCard.PaymentMethod specifies a medium by which a payment has or
will be made.PaymentMethod in human-readable form.Product interface.ProductIdentifier serves as an identifier type for
Product objects.Products.ProductPaymentEntry is used to store information of payments
of orders.ProductPaymentEntry is constructed for a specific
OrderIdentifier attached to it.