Teams running ERPNext on Stripe usually hit the same wall: ERPNext calculates tax from static Sales Taxes and Charges Templates and Item Tax Templates, while your real tax liability depends on the customer's ship-to jurisdiction, product tax code, and whether you have a registration in that state or country. Keeping those templates aligned with US economic-nexus thresholds, EU/UK VAT, and Canadian GST/HST by hand is error-prone, and the tax Stripe actually charges at the payment layer can silently diverge from what the Sales Invoice recorded. The result is under- or over-collection, painful period-end true-ups, and reconciliation done in spreadsheets.

We build a proper Frappe app (its own module, DocTypes, and hooks.py) that makes Stripe Tax the source of truth for rates and pushes Stripe hosted invoicing into ERPNext's document flow. On Sales Order and Sales Invoice validate doc events, a server-side hook calls the Stripe Tax API with the customer's address, your registrations, and the mapped product tax code, then writes the returned tax lines back onto the document's tax table so the ERPNext total matches what Stripe will collect. A Stripe Tax Settings single DocType holds API keys (stored encrypted via Frappe's password fieldtype), environment toggle, and the Item-to-tax-code mapping; a Stripe Tax Registration DocType tracks each jurisdiction where you're registered, its Stripe registration id, and active status so calculations only apply tax where you have an obligation.

For invoicing, the app can generate a Stripe hosted invoice from a submitted ERPNext Sales Invoice, store the returned hosted_invoice_url and PDF link on the document, and expose them to the customer. Incoming Stripe webhooks (invoice.paid, invoice.payment_failed, charge.refunded) are received on a whitelisted, signature-verified endpoint (frappe.whitelist(allow_guest=True) with Stripe signature validation), which creates or matches the Payment Entry, reconciles it against the outstanding invoice, and updates status. A scheduler event (hooks.py scheduler_events) runs a daily backfill to catch any webhook that was missed and to flag Stripe-vs-ERPNext tax deltas for review. Client Scripts add the action buttons and status indicators on the ERPNext form; role-based permissions and a dedicated role profile keep tax settings and API keys restricted to finance administrators.

Because this is build-to-order, nothing is a black box. We start with a short scoping call to confirm your Stripe account structure, tax jurisdictions, ERPNext version (v15 or v16), and how your Items map to Stripe tax codes. We then build against your requirements, ship to a staging bench for UAT, and hand over the full Git repository, install and configuration steps, and documentation. Typical delivery is 2 to 4 weeks from confirmed scope, and you own the source code outright.