It is a hashed email address by MD5.

Parameter is used to indicate whether the user has given consent to the processing of their personal data in compliance with the General Data Protection Regulation (GDPR) of the European Union

Built according to the GDPR TCFv2 standard

Do not track. true/false value which means if user allowed page to track his activity. true does not allow tracking. false allows tracking.

While not required, it is a good practice to use the "_" parameter as an anti-cache to ensure that users are always viewing the most current version of the webpage without any caching issues. The Unix timestamp, often to the millisecond, is commonly used as the value for this parameter.

Anonymous local user ID. Required, if user agent does not accept third party cookies. Once redirected to a website, this value should be read from the dlapi_lu URL parameter (hash or query string).

Registered account user ID (if available). Recommended, if user agent does not accept third party cookies. Once redirected to a website, this value should be read from the dlapi_aid URL parameter (hash or query string).

Source of the event: s2s - server-to-server communication, app - mobile application, paapi - Protected Audience API (Privacy Sandbox).

Session ID. Required in server-to-server communication.

URL of the page that requested this event.

User agent string.

List of IP addresses through which user connects. If the header already exists, the client IP should be appended to the existing value, separated by a comma. If it does not exist, the header should be created with the client IP address.

Tracking identifier of an event, used for test purposes