Indian GST-registered businesses on ERPNext hit a wall the moment compliance moves beyond printing a GST-formatted invoice. Sales Invoices above the e-invoicing turnover threshold must be registered with the NIC Invoice Registration Portal (IRP) to obtain an IRN and signed QR code before they are legally valid; goods movements need e-waybills raised and updated in near real time; every purchase must be reconciled against auto-drafted GSTR-2A/2B data before you can safely claim input tax credit (ITC). ERPNext core carries the GST tax scaffolding and the official india_compliance app covers a good baseline, but most finance teams still find gaps around bulk IRN handling, e-waybill edge cases, GSTIN re-verification on master changes, and a reconciliation workflow that matches their actual vendor behaviour and ITC policy. That manual glue is where errors, blocked credit, and filing delays creep in.

We build a proper Frappe app that layers the missing automation directly onto your ERPNext instance. The app ships as an installable module with its own DocTypes (for example an E-Invoice Log, E-Waybill Log, and GSTR Reconciliation document set), server-side logic wired through hooks.py doc events (on_submit, on_cancel, validate) so IRN and e-waybill actions fire deterministically from the Sales Invoice lifecycle rather than from ad-hoc button clicks. IRP and e-waybill calls run through whitelisted server methods (@frappe.whitelist()) against the government/GSP APIs, with request/response payloads, acknowledgement numbers, and signed QR strings persisted for audit. A print format renders the mandated QR code and IRN on the customer invoice. GSTIN validation runs both interactively (a client script on Customer/Supplier/Address) and in bulk, and a scheduler event (scheduler_events in hooks.py) pulls GSTR-2A/2B data on a cadence and stages it for matching. Role profiles and DocType permissions keep IRP credentials and cancellation rights scoped to your tax team.

Because this is built to order, nothing is a black box. We scope your exact turnover threshold, GSP/ASP choice, place-of-supply rules, ITC-matching tolerance, and reconciliation policy, then deliver source code tuned to that scope. Delivery is typically one working week from confirmed scope. You get the app validated on a staging copy of your ERPNext, a UAT sign-off, a documented rollback plan, and a post-go-live support window — not a marketplace download you are left to configure alone. The app targets Frappe/ERPNext v15 and v16, and the full git repository is handed over to you at the end.