Untitled

JSON body for BidBidderNotification is same as before with the addition of a "counterbid" boolean field. Note that the "owner" field containers either a user object or an Ethereum address for a non-user.

```
{
  "bidder": {
    "username": "Becky",
    "id": 5,
    "avatar": "https://ipfs.pixura.io/ipfs/QmZB7Y1sj5w28ovtSy6EFM9siFx9Sejor1opdL4zWv9WAH",
    "ethereumAddress": "0xb794f5ea0ba39494ce839613fffba74279579268"
    },
  "owner": {
    "username": "Owen",
    "id": 6,
    "ethereumAddress": "0xdeadbeef0ba39494ce839613fffba74279579268"
    },
  "price": 2.5,
  "counterbid": true
}
```

JSON body for BidOwnerNotification is same as BidBidderNotification, except that
the owner is definitely a user, and the bidder is either an address or a user.

JSON body for a SetSalePriceOwnerNotification looks like this. The "target" field
is either an address or a user

```
{
  "owner": {
    "username": "Becky",
    "id": 5,
    "avatar": "https://ipfs.pixura.io/ipfs/QmZB7Y1sj5w28ovtSy6EFM9siFx9Sejor1opdL4zWv9WAH",
    "ethereumAddress": "0xb794f5ea0ba39494ce839613fffba74279579268"
    }
  "target": {
    "username": "Owen",
    "id": 6,
    "ethereumAddress": "0xdeadbeef0ba39494ce839613fffba74279579268"
    }
  "price": 2.5,
  "currency": {
    "address": "0xdeadbeefdeadbeefce839613fffba74279579268",
    "description": "Ethereum",
    "type": "ETH"
  },
  "counterask": true
}
```

JSON body for SetSalePriceTargetNotification is same as SetSalePriceOwnerNotification, except that
the target is definitely a user, and the owner is either an address or a user.