Categories CPWP/CPWPA Certification Renewal and On-going Professional Training (OPT) Does the OPT requirement for the CPWP/CPWPA Certificate Renewal run on a calendar-year basis? Yes, the OPT requirement runs on a calendar-year basis. ← Is it mandatory to upload documents when submitting the Application for CPWP/CPWPA Certification Renewal? → How long does it take to process the application for the CPWP/CPWPA Certification Renewal?