Credits are the “currency” of a pass. Each ticket you claim using a pass requires a set number of credits.
For example:
A general admission ticket might require 1 credit
A VIP ticket might require 3 credits
These are set by the event organiser.
When you use your pass to claim tickets to an event, you’ll see how many credits are needed for each option before confirming. These will then be deducted from your total credits once you've claimed the ticket.