Some people weasel out of their responsibilities or deflect blame or dodge accountability.

The customer’s part is usually called a stub. (For example, restaurants near cinemas will sometimes advertise a discount “with a ticket stub”. The act of separating the two parts is sometimes called “tearing”; alternatively, the overall act of a gatekeeper being handed your ticket, quitting, and giving you the part back is often “taking a ticket”, same as if you didn’t get a part back.

How does the venue keep a specific word?