Certification Exam - Receipt of Payment
The confirmation email you received when you registered for the Certification Exam included the amount you paid for the exam and serves as a purchase receipt.
You may also generate a receipt by logging into HUDHousingCounselors.hud.gov, visiting the Exam Status Center via the Exam Pre-launch page and clicking "Receipts" in the blue header. The receipt will not stipulate payment type.