Nested object containing additional information.
| Name | Type | Description | Notes |
|---|---|---|---|
| source | String | The source of the referral - MESSENGER_CODE, ADS etc… | [optional] |
| type | String | The type of referral, typically OPEN-THREAD. | [optional] |
| adId | String | If the referral came from an ad, this field will be present with the ad’s Id. | [optional] |