This document provides an overview and user guide for the Open Payments (Sunshine Act) program. It explains that Open Payments promotes transparency in financial relationships between healthcare industry and providers by publishing payment data. Applicable manufacturers, GPOs, physicians, and teaching hospitals participate by registering, reporting applicable payment data, and reviewing/disputing data. Key deadlines and a two-phase registration/reporting process applied to the first reporting year of 2013. The guide details each step of the Open Payments process.