How to implement Dutch auction?

[kingaimaster94]

const auction = await openseaSDK.createListing({
asset: {
tokenId: tokenId.toString(),
tokenAddress: nftContractAddress,
name: "PrismaticNFT Collection",
},
accountAddress: activeAccount.address,
startAmount: startAmount,
endAmount: endAmount,
listingTime: Math.floor(Date.now() / 1000),
domain: 'https://www.prismaticcapital.com',
expirationTime: expirationTimeStamp,
paymentTokenAddress: paymentTokenAddress,
englishAuction: false,
});

  but "TypeError: Cannot read properties of undefined (reading 'created_date')" occurs.

[ryanio]

Dutch auctions aren't supported on OpenSea anymore, for about 1 year now.

[kingaimaster94]

Thanks for let me know that.
But when will you implement Dutch auction in OpenSea?