GST E-Invoicing | Financial Management
E-Invoice API
Programmatic IRN, e-way bill, cancellation and CDNR via a REST API. OAuth-style authentication per GSTIN. Idempotency keys built in. Webhooks fire on IRN success, failure and cancellation.
What it does
Inside E-Invoice API.
API access free for one GSTIN. Generate an OAuth client; call POST /irn with a sample payload; receive IRN in under 2 seconds.
01
IRN endpoint
02
Cancellation endpoint
03
CDNR endpoint
04
Webhooks
05
Idempotency
Where it sits
Part of GST E-Invoicing.
IRN Generation Auto-generated when you create a B2B invoice. Validation, signing and IRN return in seconds. E-Way Bills Auto-generate from invoice or trigger on dispatch. Vehicle, transporter and consignor data carried over. E-Invoice QR & PDF Signed QR and IRN-stamped PDF rendered automatically. Send to your customer in one click. Cancel & Amend E-Invoice Cancel within 24 hours; amend afterwards via credit/debit notes. All flows inline, no portal. Bulk E-Invoice Generation Bulk-generate IRNs from CSV upload, ERP feed or API call. Auto-retry on failures. E-Invoice Reconciliation Fetch IRNs and e-way bills generated outside OneFinOps. Reconciled against your books nightly. Multi-GSTIN Management Per-GSTIN settings, eligibility, sign-off. State-wise EWB thresholds. E-Way Bill Extension & Update Vehicle change, validity extension, multi-leg journey support. Export E-Invoicing IRN for export invoices with LUT/SEZ flags. Multi-currency.
Run E-Invoice API against your books.
A working session on your structure and a month of your documents.