The Submit Buy In Advance Request Action is used where the subscriber agrees to be billed for a longer period of time than that of the specified billing frequency in exchange of a discounted price.
Unlike other Subscriptions Action Types, Submit Buy in Advance Action does not have a behaviour and business code. It differs from the rest of the Subscriptions Action Types, as submitted Requests are handled by the Billing Engine during the Billing Run, rather than an actual Subscription Action.
For a complete description of how to use the specific Action refer to Managing Buy in Advance Requests.