let returnType: {
  assetContractAddress: Address;
  bidBufferBps: bigint;
  buyoutBidAmount: bigint;
  creatorAddress: Address;
  currencyContractAddress: Address;
  endTimeInSeconds: bigint;
  id: bigint;
  minimumBidAmount: bigint;
  quantity: bigint;
  startTimeInSeconds: bigint;
  status: ListingStatus;
  timeBufferInSeconds: bigint;
  tokenId: bigint;
  type: "english-auction";
};