Tellbill for WooCommerce

Tellbill is a Swiss invoicing service: QR-bill invoices (ISO 20022), automatic payment reminders, bank reconciliation and credit notes. This plugin connects your WooCommerce shop to your Tellbill account.

What it does

• When an order reaches the trigger status you choose (default: "Processing"), the plugin calls the Tellbill API and creates the matching invoice — with a Swiss QR code — then (optionally) emails it to your customer.
• The Tellbill invoice number is displayed in the orders list and in the order notes.
• Payment sync (optional): when the customer pays the QR-bill, Tellbill notifies WooCommerce through a signed webhook and the order is automatically marked as paid (stock, downloads, etc.).
• Refunds: a WooCommerce refund automatically creates the matching credit note in Tellbill (VAT included; full refund = full credit note).
• Duplicate-safe: each order is sent with a unique identifier (external_id = "wc_<order id>"). If the same order is sent twice (double status change, network retry), Tellbill returns the existing invoice instead of creating a duplicate.

Requirements: a Tellbill account (https://tellbill.ch) and an API key.

Which trigger status should you choose?

• Invoice-based selling (very common in Switzerland: the customer receives the goods, then pays within X days): trigger "Processing" or "Completed". The invoice carries your payment term; if the customer is late, Tellbill sends reminders automatically.
• Prepayment by QR-bill (the customer pays before you ship): enable the "Direct bank transfer" gateway so the order lands in "On hold", and set the trigger to "On hold". The customer receives the QR-bill, pays, then you ship.
• Paid online (card at checkout): trigger "Processing" — the Tellbill invoice then serves as a receipt and accounting record.

External services

This plugin communicates with the Tellbill API (https://tellbill.ch) — the invoicing service it connects to; that is its sole purpose. No data is sent until you configure your API key.

Data transmitted to the Tellbill API (https://tellbill.ch/api/v1, or the URL you configure):

• When an invoice is created (order reaching the trigger status): the customer's billing details (name, email, address), the order lines (item names, quantities, prices) and the order number.
• When a refund is issued: the refunded amount and the refund reason.
• When you click "Test connection": only your API key is transmitted (as a header).

This data is required to issue the invoices. It is processed by Tellbill according to its terms of service and privacy policy:

• Terms of service: https://tellbill.ch/cgu
• Privacy policy: https://tellbill.ch/confidentialite

Translations

The plugin ships with German (de_DE, de_CH), Italian (it_IT) and English (en_US, en_GB) translations — the four Swiss business languages are covered out of the box. Source strings are in French (built for the Swiss market). A .pot template is bundled in /languages for any additional language.