Advanced User Reconciliation

There are multiple ways of user identification (who did the event) on our backend systems:

1. User ID: the ones set by our Web Pixel
2. User email address of an existing user.
3. Internal Customer Id (UUID), depending on your account configuration
4. Phone Number
5. Unique identifier (_vtsid): this works in conjunction with Web Pixel and must be sent prior to Server Side request
   • set _vtsid in the event set along with a known userId (Defined by our system)
   • send the same unique _vtsid along with another any other event, without a userId, and we match it with the previous one. Not that the the timeframe between events is maximum 24 hours