API Integration for India Businesses
GST e-invoicing and PAN/Aadhaar/bank verification -- automated, not manual data entry.
GST e-invoicing integration is required for businesses above the e-invoicing turnover threshold -- invoices need to be pushed to the government's Invoice Registration Portal (IRP) to get an IRN and QR code before they're legally valid. This gets integrated directly into your billing/order system so an invoice is generated and registered in one step, not two separate manual ones.
PAN and Aadhaar verification API integration is the other common request, mostly from fintech-adjacent businesses, lending platforms and marketplaces doing seller/customer KYC -- confirming a PAN or bank account is genuine before onboarding someone, rather than manually checking documents.
Everything needed to get this API live, tested and reliable
COMPLIANT BY DEFAULT
Invoices generated in your system are automatically registered with the government IRP for an IRN and QR code.
AUTOMATED KYC
Real-time PAN and Aadhaar verification during onboarding instead of manual document checks.
PENNY-DROP VERIFICATION
Confirm a bank account is genuine and name-matched before payouts or refunds are processed.
Both get you a valid IRN -- the difference is who you deal with and how much setup is involved
| Option | Best For | Worth Knowing |
|---|---|---|
| Direct NIC/IRP integration | Businesses wanting one less vendor relationship and full control over the API connection | Requires your own API credentials with the government portal and handling their specific authentication flow directly. |
| GSP (GST Suvidha Provider) middleware | Businesses wanting a simpler API with better documentation and support | Adds a small per-invoice or subscription fee on top, but abstracts away some of the IRP's rougher edges. |
| Manual portal entry | Very low invoice volume where automation isn't worth building | No integration cost, but every invoice is manually typed into the government portal -- doesn't scale past a handful a day. |
Issues seen often enough on real projects to plan around from day one
The government portal does have downtime and does reject invoices for schema/field errors -- a billing system that assumes every submission succeeds instantly will generate invoices that were never actually registered.
HSN codes, specific address formats and other mandatory fields cause a straight rejection from the IRP if missing or malformed -- these get validated before submission, not discovered after.
Whether e-invoicing applies to your specific turnover and business type is a question for your CA, not something to assume from a blog post -- the integration handles the technical connection once that's confirmed.
Check whether e-invoicing applies to your business (worth confirming with your CA) and review your current billing system's data fields.
API credentials set up either directly with the IRP or through a GSP, based on which fits your volume and budget.
Integration built and tested against the portal's sandbox with your actual invoice formats, catching field/schema issues before go-live.
Switched to production with a reconciliation check so every invoice generated actually has a valid IRN and QR code.
Free consultation. No obligation. Get a fixed-scope quote in INR within 24-48 hours.
Start a Project See My WorkNeed more than one API connected? These are usually scoped together as a single project.