The click ID (fclid parameter) is an alphanumeric id that we generate when a user leaves our website. We pass this value to you as part of the deeplink. When the user lands on your site, we request that you capture this value, track it and send it back to us at the confirmation stage via the pixel.
This allows us to link a user entering our site to a booking that was made. This way we can change our marketing efforts (in real time) to ensure that we send you the most converting traffic possible.
You can track this parameter however you wish e.g. in a session, url etc. The way you do so is up to you and is not stipulated by us