Originally Posted by superman26
If I use this code: A153700 Avis Employee Discount Rate, will they find out who's employee or not?
Welcome to FT, superman!
This code has been discussed many times (the search function is your friend), but I'll give you the executive summary: don't use it, you will likely be asked for ID/letter of authorization, and if you can't provide it, you will either walk or pay walk up rates.
Check the earlier pages of this thread for more detail.