Can we buy and sell on opensea with seaport?

[FloUz-ai]

I went throught the seaport doc several times. If I do understand the main goal, I stilll don't understang if I can sell and buy via this one.

There is a complete explanation about seaport on opensea website but when I use the code example given on the first page. My asset is not bought on open sea by the buyer ...

      offer: [
        {
          itemType: ItemType.ERC721,
          token: token,
          identifier: "0",
        },
      ],
      consideration: [
        {
          amount: ethers.utils.parseEther("0.1").toString(),
        },
      ],
    },
    offerer
  );

  const order = await executeAllActions();

  const { executeAllActions: executeAllFulfillActions } = await seaportBuyer.fulfillOrder({
    order,
    accountAddress: fulfiller,
  });

  const transaction = executeAllFulfillActions();```
  
  Any explenation would be very appreciate please :)