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Payments and GST e-Invoicing Integration

UPI in, IRN out, and the two agreeing at month end.

Razorpay IRP API e-Way Bill API Webhooks

Payments and GST e-Invoicing Integration GST e-invoicing is registering a tax invoice with the government portal before it reaches the customer, and printing the IRN and signed QR code it returns on the document.

Taking the money is one integration. Reporting it is another. We wire the gateway, the IRP for e-invoicing and the e-way bill into the same system, so the accounts team stops retyping.

What is in it

  • 01Gateway integration with webhooks, refunds and settlement reports
  • 02IRN and signed QR from the invoice registration portal, printed on the bill
  • 03e-Way bill generation for goods above the threshold
  • 04A reconciliation screen that matches gateway settlements to your sales
billing.demo / invoice 0418Demo data
Tax Invoice
Shree Lakshmi Traders
Car Street, Udupi 576101
GSTIN 29ABCDE1234F1Z5
INV/2026/0418Date 14-10-2026
Place of supply Karnataka (29)
Reverse charge No
Billed toKadri Hardware & ElectricalsKadri Road, Mangaluru 575002
GSTIN 29AACCP5678K1ZV
Shipped toSite store, KarkalaHebri Road, Karkala 574104
Vehicle KA 20 AB 4471
DescriptionHSNQtyRateAmount
Steel almirah 6 ft9403412,40049,600
Ceiling fan 1200 mm8414181,95035,100
LED batten 20 W94056031018,600
Water pump 1 HP841322,3004,600
Amount in wordsRupees One Lakh Twenty Seven Thousand Three Hundred Twenty Two OnlyIRN 7a3f91c4e8b2d05f6a71
e-Invoice registered · e-Way bill 4418 9023 7761
Taxable value₹1,07,900
CGST 9%₹9,711
SGST 9%₹9,711
Round off₹0
Total₹0

Illustrative screen. A GST invoice drawn in HTML and CSS. Shop names, GSTINs, vehicle number and amounts are made up for the demonstration.

What happens, in order.

There is no rate card on this page. The honest price depends on what we find in your current system, and we would rather look first than publish a number we would have to take back.

  • Scope in writing before any code01
  • Billed on completion, stage by stage02
  • Source code in your repository03
  • Hosting and domain in your name04
  1. 01

    A call, then a scope

    Half an hour on the phone, then a written scope with stages, timeline and price. You can take that document to anyone else for a second quote.

  2. 02

    Stage by stage

    Each stage is fixed in scope and billed on completion. If you want to stop after stage two, you stop after stage two and keep what is built.

  3. 03

    Handover that means something

    Source code in your repository, hosting and domain in your name, a written note of how it works, and training for the people who will use it.

Read next

Payments and GST e-Invoicing Integration, in short

01Does e-invoicing apply to us?
It depends on your turnover against the current threshold, and that threshold has been lowered several times. We check your slab against the rule in force rather than guessing, because getting it wrong is a compliance problem, not a software one.
02What actually has to happen for an e-invoice?
The invoice goes to the government portal before it goes to your customer, and comes back with an IRN and a signed QR code that must be printed on it. Your billing software has to handle the portal being slow or down without losing the bill.
03Why do UPI collections not match the books?
Usually settlement timing and charges. The money arrives net of fees and on a different day from the sale, so the reconciliation has to match on the gateway reference rather than on the amount.

Payments and GST e-Invoicing Integration, for your business.

Tell us what you are running now and what is going wrong with it. A few lines is enough to start.

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