IRP6 is a leading government-approved Invoice Registration Portal (IRP) authorized by the Indian government for companies to create e-invoices under GST. Taxpayers can register their B2B invoices and export invoices to obtain a unique Invoice Reference Number (IRN). An invoice is regarded as invalid in the absence of the IRN number. The IRP generates and returns a unique Invoice Reference Number (IRN), digitally signed e-invoice, and QR code to the user. The IRP also checks for de-duplication, digitally signs validated invoices, creates QR codes for verified invoices, and allows for IRN cancellation: https://einvoice6.gst.gov.in/login