post
https://sellingpartnerapi-na.amazon.com/inbound/fba/2024-03-20/inboundPlans//shipments//deliveryWindowOptions//confirmation
Confirms the delivery window option for chosen shipment within an inbound plan. A placement option must be confirmed prior to use of this API. Once confirmed, new delivery window options cannot be generated, but the chosen delivery window option can be updated before shipment closure. The window is used to provide the expected time when a shipment will arrive at the warehouse. All transportation options which have the program CONFIRMED_DELIVERY_WINDOW require a delivery window to be confirmed prior to transportation option confirmation.