Practical guides on GST compliance, e-invoicing, and running the finance side of an Indian business.
How to integrate an accounting-grade invoicing API with your application: sync vs async architecture, idempotency, webhooks, GST payload specifics, testing, and a go-live checklist.
Payment gateway invoicing collects money; it doesn't keep books. Where gateway invoices stop — numbering, IRNs, GSTR-1, ledgers, credit notes — and how the two layers work together.
The gap between generating invoices and keeping books: what must stay in sync (ledgers, payments, credit notes, AR ageing), why the CSV bridge fails, and why atomic posting matters.
A duplicate invoice is worse than a failed one. Idempotency keys done right, the retry decision tree for ambiguous timeouts, and webhook handlers that survive production.
Billing-day spikes break synchronous invoicing. The async batch pattern — acknowledge fast, queue, confirm by webhook — plus GST specifics and reconciliation for subscription billing.
How to integrate e-invoicing into your application: the IRP flow, why you shouldn't call the IRP directly, handling rejections, duplicates and the 24-hour cancellation window.
Turn every website order into a compliant GST invoice automatically — field mapping from order data, B2B vs B2C branching, returns as credit notes, and the webhook-in, API-out pattern.
Your app already creates invoices — should you build the accounting and GST layer behind them, or integrate one? The true cost of building, when each wins, and a decision checklist.
What a bill of supply is, how it differs from a tax invoice, who must issue one (exempt goods, composition dealers), the mandatory fields, and why it carries no ITC.
What a delivery challan is under GST, when you must use one instead of a tax invoice, the mandatory fields it needs, and how it connects to the e-way bill.
How the GST invoice format differs across retail, transport, services, and manufacturing — what's always mandatory, what changes, and a free template for each.
How to cancel an e-way bill — when it's allowed, the time limit to do it, the step-by-step process, the difference between cancel and reject, and the next steps.
What Part B of an e-way bill is, how it differs from Part A, when it's required, how to update vehicle details, and how transhipment is handled.
The GST return due dates at a glance — GSTR-1 and GSTR-3B for monthly and QRMP filers, late fees if you miss, and how to stay on top of every deadline.
How to file GSTR-3B step by step — the data you need, how output tax and input tax credit net off, due dates and late fees, and the errors to avoid.
A beginner-friendly walkthrough of filing your first GSTR-1 — what you need, the step-by-step process, where B2B and B2C data goes, and mistakes to avoid.
E-invoice vs e-way bill compared: purpose, trigger, who issues each, validity, and whether you need both — with a clear at-a-glance breakdown.
The e-invoice turnover limit explained — who it applies to, how the threshold has fallen over the years, and exactly what to do once your business crosses it.
Who can opt for the GST composition scheme, the turnover limit and tax rates, the returns to file (CMP-08, GSTR-4), and the restrictions — including no input tax credit.