bank.sx

{
  "name": "callback",
  "base": "",
  "fields": [
    {
      "name": "code",
      "type": "name"
    },
    {
      "name": "receiver",
      "type": "name"
    },
    {
      "name": "amount",
      "type": "extended_asset"
    },
    {
      "name": "fee",
      "type": "asset"
    },
    {
      "name": "memo",
      "type": "string"
    },
    {
      "name": "notifier",
      "type": "name"
    }
  ]
}