It is $54 and must be paid while you are making your reservation. They accept payment via a credit card, debit card, electronic check, or voucher. It is non-refundable and non-transferable. Payments are not accepted at the test center.
If you pay with an electronic check, make your reservation at least 5 days before the exam date in order for your check to process.
A single payment that covers more than one test taker will not be accepted.