This paper is intended to assist organizations that want to become certified by the California Energy Commission (CEC) to provide data registration services for energy code compliance documents. Specifically, it describes the mandatory requirements and optional CEC staff recommendations for preparing their application for use of an external digital data source for data exchange transactions. This paper provides a checklist for applicants to use when developing their applications and describes the process and criteria that CEC staff will use in reviewing each application. Staff’s review and recommendations will be considered by the CEC commissioners or executive director to approve each application.