GSTN has begun offering e-invoice registration services through a number of private IRPs as another move towards further digitizing the business process flow.
GSTN recently has onboarded four new IRPs (Invoice Reporting Portals) for reporting e-invoices in addition to NIC-IRP. IRIS is one of the first four chosen IRPs and will be available to generate IRNs via einvoice6.gst.gov.in.