PendingSwapOf: StorageDescriptor<FixedSizeArray<2, number>, {
    deadline: number;
    desired_collection: number;
    desired_item?: number;
    price?: {
        amount: bigint;
        direction: Enum<{
            Receive: undefined;
            Send: undefined;
        }>;
    };
}, true>

Handles all the pending swaps.