My National Police Check with uPaged

How do I apply for a new National Police Check with uPaged?
How do I get reimbursed for the cost of my Police Check?
Why do I need a National Police Check to work in uPaged hospitals?
I already have a National Police Check. Why do I need another?
Who are InterCheck? I want to know who will be processing my National Police Check for uPaged.
What if there is a change to my criminal history or ability to work since my uPaged National Police Check?