Payment plans and installment previews

Prior to binding and after quoting, the Payment screen displays the available payment plans and supports opening a preview screen for the installments for a selected plan. Your billing plugin must be able to retrieve both these types of information. PolicyCenter uses a PaymentPlanSummary entity instance to store summary information about the payment plan for a bound submission. Your billing plugin must be able to create this entity instance, populating its properties from an instance of a Gosu class that has a similar structure.