{
  "commission": "<UInt16>"
}

None

{
  "Enum": [
    {
      "Remove": {
        "address": {
          "index": "<UInt64>",
          "subindex": "<UInt64>"
        },
        "owner": {
          "Enum": [
            {
              "Account": [
                "<AccountAddress>"
              ]
            },
            {
              "Contract": [
                {
                  "index": "<UInt64>",
                  "subindex": "<UInt64>"
                }
              ]
            }
          ]
        },
        "token_id": "<String with lowercase hex>"
      }
    },
    {
      "Add": {
        "address": {
          "index": "<UInt64>",
          "subindex": "<UInt64>"
        },
        "owner": {
          "Enum": [
            {
              "Account": [
                "<AccountAddress>"
              ]
            },
            {
              "Contract": [
                {
                  "index": "<UInt64>",
                  "subindex": "<UInt64>"
                }
              ]
            }
          ]
        },
        "price": "<Amount in microCCD>",
        "quantity": "<String of size at most 74 containing an unsigned integer.>",
        "royalty": "<UInt16>",
        "token_id": "<String with lowercase hex>"
      }
    }
  ]
}