### Learn more about user matching [here](https://dev.kevel.co/docs/user-matching). For nearly every situation, you won't be pinging this endpoint directly - but appending the Kevel pixel to the RTB partner's user matching endpoint.

#### Parameters

- **networkId**  
  *int32*  
  *required*  
  Your account (network) ID

- **partnerId**  
  *int32*  
  *required*  
  The ID of the RTB provider in Adzerk. Contact Support if you don't have the ID.

- **userId**  
  *int32*  
  *required*  
  This is the UserID the individual RTB provider has of the user. This is NOT the UserDB userkey.

- **property**  
  *string*  
  Appends one or more key/value pairs to be shipped to UserDB logs. In the format `?property:Key1=Value&property:Key2=Value` etc.

### HTTP Response Status

- **200**  
  *OK*

### Base URL

```
https://e-networkId.adzerk.net/udb/networkId/sync/i.gif?partnerid={partnerid}&userId={userid}
```

### Example

```
curl -b "azk=ue1-e397eb5990" "https://e-23.adzerk.net/udb/23/sync/i.gif?partnerId=1&userId=12345"
```

[Returns a 1x1 transparent GIF image]