Modules available over MCP

Invoicing MCP: quotes and invoices handled by your AI

Ondes PRO’s MCP server opens your workspace’s invoicing to your AI assistant: it drafts a quote, sends it, turns it into an invoice once accepted, chases overdue invoices and issues a credit note when something needs fixing. Every write goes through the real billing/devis, billing/factures and billing/avoirs resources — and an issued invoice can never be deleted or voided.

Updated on 21 October 2026

“Cancel that invoice”: how a well-guarded AI responds

Galerie Ressac sent back a Brass pendant that arrived scratched. Sophie Arnaud, who keeps Atelier Lumen’s books, asks for a correction.

Claude · Example conversation · demo data (Atelier Lumen)

You : Cancel invoice FAC-2026-0203 for Galerie Ressac and reissue it without the returned Brass pendant.
MCP tool : ondes_impossible Confirms that an issued invoice can be neither deleted nor voided: corrections go through a credit note.
MCP tool : ondes_appeler GET billing/factures searching FAC-2026-0203 — paid, 3 lines, including 1 Brass pendant at €245 excl. VAT, 20% VAT.
Assistant : An issued invoice cannot be cancelled: the rule is to issue a credit note. I suggest a partial credit note of €245 excl. VAT (€294 incl. VAT) against FAC-2026-0203, reason “Return of a damaged Brass pendant”. The invoice stays paid; the credit note records the refund owed to the gallery. Shall I issue it?
You : Yes, and send it to them.
MCP tool : ondes_appeler POST billing/factures/203/avoir/ (nature: partiel, reason, amount, rate) — credit note AV-2026-0011 issued, real write stated.
MCP tool : ondes_appeler POST billing/avoirs/11/envoyer/ — PDF emailed to the gallery.
Assistant : Credit note AV-2026-0011 is issued and sent. If another item came back, a second credit note on this invoice would be capped at the gross amount still left to credit.

What your AI can read and do in invoicing

An invoicing MCP server is only useful if it follows the same rules as the screen. Ondes PRO’s calls the API’s real actions: create a quote and its lines, get its net, VAT and gross totals, email it as a PDF, duplicate it, send it for e-signature, then convert it into an invoice once the customer accepts.

On invoices, the assistant reads each document’s state — including “overdue”, which is never typed in by hand but computed (due date passed and invoice unpaid). It can record a payment, email reminders for the overdue invoices in a selection, export a list as CSV for your accountant, and issue a full or partial credit note.

Invoicing resources available over MCP

Resource	What the AI reads	What the AI can do
`billing/devis`	Quotes, status, customer, totals, PDF	Create, `envoyer/`, `dupliquer/`, `vers-signature/`, `convertir-facture/`, `statut/`
`billing/lignes-devis`	Quote lines	Add, edit or remove a line
`billing/factures`	Invoices, state (incl. overdue), due date, totals	`envoyer/`, `statut/` (paid), `avoir/`, `relancer/`, `exporter/`
`billing/lignes-facture`	Invoice lines	Add or edit a line
`billing/avoirs`	Issued credit notes, reason, amount	`envoyer/` the credit note PDF
`billing/clients`	Billed customers, contact details	Create or update a customer

If no number is supplied, a quote is numbered automatically in the company’s sequence (DEV-2026-…).

Issued invoice, credit note required: invoicing safeguards

An AI that invoices has to follow invoicing rules, not work around them. They are written into the API.

No invoice deletion: invoices are kept by legal obligation. The resource has no DELETE, and ondes_impossible tells the assistant so before it goes looking for a route that does not exist.
No voiding, a credit note instead: the “cancelled” status is refused. A credit note requires a reason, can be full or partial, and its total is capped at the invoice’s gross amount.
Dedicated numbering: credit notes follow their own sequence (AV-YYYY-NNNN), in the company of the invoice concerned.
“Overdue” is computed: the assistant cannot mark an invoice overdue, nor take one out of that state by changing its status. Only payment changes it.
Targeted reminders: relancer/ automatically skips invoices in the selection that are not overdue.
Real writes are flagged: invoicing has no test twin. Every write is reported as real, and simuler: true lets you check a quote before creating it.

Typical requests and what happens

You ask	What the assistant does
“Quote 6 showroom armchairs for Le Fil Rouge.”	Dry-runs the body, creates the quote and its lines in `billing/devis`, gives you the totals.
“Le Comptoir des Marées accepted — invoice them.”	Sets the quote to accepted, then calls `convertir-facture/`.
“Chase every invoice more than 15 days overdue.”	Lists overdue invoices, shows them to you, then calls `relancer/`.
“Studio Nord paid by bank transfer yesterday.”	Calls `statut/` with “paid” and the payment date.
“Export October’s invoices for the accountant.”	Filters the month’s invoices and calls `exporter/` (CSV, semicolon-separated).

The invoice at the end of a chain of modules

MCP servers built only for invoicing stop at the document. In Ondes PRO, the same conversation can start from the customer’s record in the CRM, check availability in inventory management, then produce the quote — and, once accepted, put the delivery date in the calendar.

The other way round, an invoice that stays unpaid can become a follow-up task in Kanban, or a note on the customer’s CRM record after your call. These hops come naturally because one server handles every module, with one set of permissions.

Keep exploring

Frequently asked questions

What is an invoicing MCP server?

It is a standard connector that lets an AI assistant read and produce quotes, invoices and credit notes in your software. Ondes PRO’s is built into every workspace and applies the same rules as the invoicing screen.

Can the AI delete or void an invoice?

No. An issued invoice cannot be deleted and never moves to a “cancelled” status: corrections go through a full or partial credit note, with a mandatory reason and a total capped at the invoice’s gross amount.

Can it chase customers who pay late?

Yes. The relancer/ action emails a reminder for each overdue invoice in a selection and skips the rest. The “overdue” state is computed from the due date and the payment.

Can the AI turn a quote into an invoice?

Yes: once the quote is accepted, the convertir-facture/ action creates the matching invoice with frozen lines. The assistant can also send the quote for e-signature beforehand.

Is there a test mode for invoicing?

No, invoicing has no test twin: every write is real and reported as such. Before a first create, simuler: true checks the request body without saving anything.

Can my accountant get the invoices?

The assistant can export a selection of invoices as CSV (semicolon-separated, comma as decimal mark), a format that opens straight in a spreadsheet.

Plug your AI into your business

The MCP server is included in every plan, with no add-on or extra fee.

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