I want to track users who has completed the booking process via counting "booking success" page.
I found the traffic number is less than actual number recored in system.One case maybe occurs when user arrived "booking success" page and jump to another page immediately, but analytics haven't fired Beacon to server.
How can I solve this problem?
How large is the gap? Anything within 0-4 percent is well within industry standards.
You will always have a gap due to users on ad blockers or using browsers like Brave. A gap can also be caused by internal users purchasing (if you have say an internal IP filter).
I would initially focus more on setting up this type of process, so you can automate the validation and monitor if the rate changes over time.Validating Orders & Revenue - Analytics Demystified