What is a verizon billing password?

is it the password to your myverizon account? does your billing password ever get put on your phone bill when it's mailed to you, and if so, when? please give me all info concerning the billing password. thank you.|||It is not for internet my account. Usually 4-5 digits or letters and is set by owner of the account. Owner can have it removed or reset by calling and verifying full social and address. It is not mailed