MercExe
GST e-invoicing with IRN, email, and WhatsApp delivery

GST E-Invoicing

Portal IRN, then mail or WhatsApp

Generate a GST e-invoice from a confirmed B2B invoice, print IRN and QR on the PDF, and send that same document by email or WhatsApp.

See how it worksRequest a demo

From invoice to customer

One document, three destinations

MercExe does not treat GST e-invoicing as a separate product. The invoice you confirm is the invoice you register, print, email, and send on WhatsApp.

  1. 01Confirm invoice
  2. 02Generate IRN
  3. 03Print with QR
  4. 04Email
  5. 05WhatsApp

India GST

GST e-invoicing

On a confirmed sales invoice for a business customer with GSTIN, generate the e-invoice against the GST portal using your GSP credentials. Cancel it on the portal when the invoice must change. IRN status stays on the document so you do not edit or double-submit by accident.

  • Generate and cancel from View Invoice — no re-keying tax lines
  • GSP GSTIN, user, and password in Tax Configuration, with verify-and-save
  • IRN printed on the PDF; Signed QR in the footer after generation
  • Edit blocked until the e-invoice is cancelled
GST e-invoice generation with IRN and QR code

On the PDF

IRN and QR on the customer copy

After the portal returns an IRN, print and preview use the same invoice PDF. The IRN appears in the document summary; the signed QR is rendered on the invoice so the customer copy matches what GST expects.

  • IRN text on branded PDF themes and thermal layouts that support it
  • QR generated from the signed QR payload, not a placeholder image
  • Same CGST, SGST, IGST, and cess lines as the invoice
  • GST on the books →
Invoice PDF showing IRN and GST QR code

Send the copy

Mail and WhatsApp integration

Print preview is the hub. Email attaches the PDF from your outgoing mail config. WhatsApp uses approved templates and the customer phone, with the document attached.

Email invoice PDF from print preview

Mail

Send from Print or Send on the invoice. The PDF is attached automatically. To is filled from the customer email; you can add CC, subject, and a message before it goes out through Mail Configuration.

  • Outgoing mail: SMTP with username, app password, or OAuth 2
  • From address and sender name set once in Settings
  • Works for invoices, estimates, payments, bills, and purchase orders
WhatsApp invoice template with PDF attachment

WhatsApp

Send via WhatsApp from the same preview. Phone is normalized to international format. Templates for invoice, estimate, payment receipt, bill, purchase order, and vendor payment live in WhatsApp Configuration.

  • Approved templates synced from your WhatsApp account
  • Recipient phone editable before send; PDF attached as media
  • Preview the template wording with document number before you send

Not only invoices

Documents you can send

GST e-invoicing applies to eligible B2B sales invoices. Mail and WhatsApp cover the rest of the trading paper trail so customers and vendors get the same PDF you print.

  • Sales invoices with GST IRN when generated
  • Estimates, credit notes, and payment receipts
  • Purchase orders, vendor bills, and vendor payments
Invoices, estimates, and receipts sent by email and WhatsApp

Why MercExe e-invoicing

Portal and PDF stay in step

IRN and QR come from the generated e-invoice, not a paste into a template. Cancel on the portal before you edit.

Mail from your own sender

SMTP or OAuth 2 in Mail Configuration. The customer sees your from-address with the invoice PDF attached.

WhatsApp without a side app

Templates and phone live in Settings. Operators send from print preview on the same invoice they just confirmed.

GST already on the line

CGST, SGST, IGST, and cess are calculated on the invoice. E-invoicing submits those lines; it does not ask you to type them again.

See GST e-invoicing with mail and WhatsApp

Walk through generate, IRN on the PDF, email, and WhatsApp send with a product specialist.

Request a demo