User ID for the cross-device support

The Usetiful script consists of two parts: This part is responsible for the segmentation and personalization of the service to anonymous users. It is used for the identification of unique logged-in users. See how Tags are used for segmentation and personalization. This part is responsible for the experience layer, interaction with the site, and reporting on user behavior. It uses the variables set up in the previous part. To enable Usetiful recognizing users across multiple devices we will need to provide a unique user ID whenever the Usetiful script is loaded on-page. This is done by customizing the first part of the script. We introduce a new variable (tag) with the name "userId" into the array usetifulTags. The content of this variable needs to be a unique ID of the logged-in user. If no userID is provided, Usetiful will rely on the browser's local storage contents to serve the content. Please note - the content of the userId tag must always be a string data type. Example:

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