Business · Live
E-Invoice API (IRN Generation)
Register an invoice and get its IRN, signed QR and acknowledgement.
What the E-Invoice (IRN) API does
Register invoices with the Invoice Registration Portal and receive the IRN, signed QR code and acknowledgement number in one call — the step that makes a B2B invoice legally valid above the e-invoicing threshold. Calls carry your own GST portal API credentials (GSTIN, username and password), so filings are made as you, on your own registration. We never file on our own account.
Popular use cases
- →Accounting and billing software registering invoices at issue
- →ERP systems automating B2B compliance above the turnover threshold
- →Marketplaces issuing invoices on behalf of registered sellers
curl -X POST https://apisathi.in/gw/v1/einvoice-generate-irn-v1/ \
-H "X-API-Key: live_xxx" \
-H "Content-Type: application/json" \
-d '{ "gstin": "23BEFPJ5660F2ZP", "username": "your_portal_user", "password": "•••", "payload": { "Version": "1.1", "DocDtls": { "No": "INV-001" } } }'{
"success": true,
"data": { "Irn": "a5c…", "AckNo": 112010036356, "SignedQRCode": "eyJ…" }
}Frequently asked questions
What is an IRN and when do I need one?
The Invoice Reference Number is issued by the government when an invoice is registered. Businesses above the e-invoicing turnover threshold must register B2B invoices before issuing them.
Do you store my invoice data?
No. The payload is relayed to the portal and the response returned to you. We record the call for billing and support — never the invoice contents.
Can I generate an e-way bill from the IRN?
Yes, without re-keying the invoice. There is a separate endpoint that raises the e-way bill directly from a registered IRN.
Start using the E-Invoice (IRN) API today
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