Register for the ImPACT Test PrePaid – using code Please enter the authorization code that you were given to take the test. If you do not have an authorization code or you are having trouble, please contact us at (303) 938-9244. Code Submit Pay Using PayPal If you don’t have authorization code, you can pay using your credit card or PayPal account. After payment, you will be taken to the test. Payment options PayPal – The safer, easier way to pay online!