The document discusses e-invoicing in India, which involves generating invoices electronically and validating them through the GSTN portal. E-invoicing will be mandatory for businesses with over 100 crore turnover from January 2021. Key aspects covered include the e-invoicing process, integration with ERP systems, benefits like standardization and automation, and changes required to ERPs for compliance. E-invoices are generated within ERPs, validated by the IRP which issues an IRN and QR code, and details flow to GST and e-way bill systems in real-time. ERP changes include preparing JSON files, capturing transaction types, and integrating with APIs to exchange data.