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Payments & GST e-Invoicing Integration

E-invoicing is not an accounts task. It happens at the moment of billing, or the invoice can never be made valid at all.

Built with proven, modern technology

What is included

Everything you need. Nothing you do not.

UPI treated properly

As the primary method most Indian customers use, not an option listed under cards.

IRN and signed QR

Registered with the IRP at billing time and printed on the face of the invoice.

Survives portal outages

Queues and retries rather than losing the sale or printing something invalid.

Cancellation handled

Inside the window it cancels; outside it, a credit note. Staff cannot simply delete a registered invoice.

Built properly

Made to last. Not just launched.

Two integrations decide whether an Indian business can genuinely transact: taking money, and issuing an invoice the buyer can claim credit against. Both look simple, and both have edges that only appear in production — failed UPI callbacks, partial refunds, and a government portal that is not always available when a customer is standing at your counter.

API Payments CRM ERP Logistics Your app

UPI treated properly

As the primary method most Indian customers use, not an option listed under cards.

Refunds and reconciliation

Including partial refunds and settlement matching, which is where most integrations quietly break.

Stored, not just printed

IRN, acknowledgement number and QR payload kept in your database where they belong.

How we work

A clear path to shipped.

Every project runs the same honest way — so you always know what is happening and what comes next.

Discovery_

We map your goals, users and constraints, then scope it honestly.

fixed quote
Design_

Wireframes and a clear plan you approve before we build.

you approve
Build_

Clean, documented code shipped in reviewable stages.

weekly demos
Launch_

We deploy, hand over the keys, and support what we ship.

you own it

Why teams choose us

Built to deliver real outcomes.

Design, build, and maintenance under one roof — so nothing gets lost in hand-off and you get software that lasts.

ProcessDeliverablesSupport

You get clean, documented code you own outright, shipped in stages you can see — and a team that stays on to support what it built.

The Whirl Designs promise
worldwide delivery
PLATFORMS & TECH

Engineering you can build on.

Clean, documented, tested code on a modern, proven stack — the foundation that keeps your payments & gst e-invoicing integration fast and dependable for years.

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integrations/payments.ts
await fetch("https://api.yourapp.com/orders", { method: "POST", headers: { Authorization: `Bearer ${key}` } }); 200 OK · webhook delivered

Ready when you are

Let's build something that lasts.

Tell us the problem you are solving and we will come back with a clear, honest plan.

50+
projects shipped for local & global clients_
100%
of the code is yours to keep_
2
studios — Udupi & Mangalore, worldwide delivery_

Questions

Payments & GST e-Invoicing Integration — FAQ

Does GST e-invoicing apply to my business?
It depends on your aggregate turnover against a threshold that has been lowered several times since introduction. Check with your CA — a good number of businesses crossed it without noticing.
What happens if the government portal is down?
A correctly built system queues the invoice and retries. What it must never do is print an unregistered invoice that looks registered, which is the failure we see most often.
Can you add this to software we already have?
Usually yes, if it can be extended. We integrate into existing billing far more often than we replace it.

Let's build

Ready to start your payments & gst e-invoicing integration project?

Tell us what you're building. We'll come back with a clear, honest scope — no jargon, no lock-in, no fluff.

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