| Parameter Name | Description | Required for Computer/Mobile (C/M) | Required for CTV | Example Value | 
| session_id | Unique, client-generated value that represents uninterrupted app interaction by no greater than 30 minutes. Must match session_id in other files | ✔ | Required | R487421B-XXXX-YYYY-3343-E3BBB46E44F2 | 
| device_id | Mobile Ad ID (IDFA, ADID), Connected Device ID. Should not be the user ID. If hashing required, SHA-256 is preferred | Required | Preferred if available | A487421B-XXXX-YYYY-8343-E3BBB66E44F2 | 
| is_device_id_hashed | If device_id is SHA-256: hashed = 1, else = 0 | ✔ | ✔ | 0, 1 | 
| hem_sha256 | SHA-256 hashed email Note: email normalization rules applied before hashing | ✔ | ✔ | 55C06A30DAA5D5F382FDEB8C702EC57875CC9D91A7C78BB620053FD81DC4335C | 
| country | Country of delivery ISO 3166 ALPHA-2 (US, CA, etc.) | Preferred, else derived from IP | Preferred, else derived from IP | US | 
| uoo | User opt out flag (demographic measurement – based on OS “Limit Ad Tracking” or “Opt out of Ads Personalization” setting): 0 = not-opted-out, 1 = opt-out | ✔ | ✔ | 0, 1 | 
| timestamp | Server Unix time in milliseconds (UTC) when exposure occurs | ✔ | ✔ | 1548395046744 | 
| param | desc | ✔ | ✔ | Example | 
| param | desc | ✔ | ✔ | Example | 
| param | desc | ✔ | ✔ | Example |