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https://sellingpartnerapi-na.amazon.com/inbound/fba/2024-03-20/inboundPlans//cancellation
Cancels an Inbound Plan. Charges may apply if the cancellation is performed outside of a void window. The window for Amazon Partnered Carriers is 24 hours for Small Parcel Delivery (SPD) and one hour for Less-Than-Truckload (LTL) carrier shipments.