The document outlines the functional workflow and important features of the GST system, presented by Shashi Bhushan Singh on February 7, 2017. It covers new features in the revised GST law, processes related to GSTR forms 1, 2, and 3, as well as handling credit notes and discrepancies in tax reports. Additionally, it discusses various scenarios, amendments, and the challenges associated with tax invoice submissions and mismatches.