Payment and confirmation procedures vary by testing vendor. In general, if you pay by credit card, you can immediately schedule your exam. If you pay by check, you will need to wait until it is received and payment is confirmed. You should arrive 15 minutes prior to the scheduled exam time to sign in. Take the exam.
All exams are closed book and are administered on a personal computer.
When you pass an exam, you will automatically receive credit. You can re-register for an exam if you fail.