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Money and orders

Billtobox MCP server

Billtobox, Unifiedpost’s invoicing platform, is where many Belgian and Dutch businesses and their accountants receive and send their invoices. Through Flowplane an AI assistant can look through the purchase and sales invoices of a company, with their amounts, VAT, payment status and what is still open, and its customers, suppliers and payments. It only reads: it changes nothing in Billtobox.

Connect Billtobox →Set up your assistant
Tools
10 read-only
Sign-in
Your own account
Approval, by default
Nothing changes
MCP server
Flowplane’s tools
What it can do

What your assistant can do in Billtobox

10 tools, all of which only read in Billtobox.

Reads10

  • Check the connectionSee which account it uses and whether it workswhoami
  • List clientsThe companies you can seelist_clients
  • Get clientA company's detailsget_client
  • List purchase invoicesInvoices receivedlist_purchase_invoices
  • Get purchase invoiceA received invoice's detailsget_purchase_invoice
  • List sales invoicesInvoices sentlist_sales_invoices
  • Get sales invoiceA sent invoice's detailsget_sales_invoice
  • List debtorsCustomerslist_debtors
  • List creditorsSupplierslist_creditors
  • List paymentsA company's paymentslist_payments
How it connects

Sign-in

Each person signs in with their own Billtobox account, so the assistant sees exactly the companies and records that user may see. An accountant’s login reaches all the client files it has access to; a business owner’s, their own company. Billtobox hands Flowplane a login that it keeps sealed; the assistant never sees it.

In Flowplane: In the Flowplane console, add Billtobox, choose Sign in with Billtobox and allow the access it asks for.

MCP

Billtobox and MCP

Billtobox has no official MCP server of its own. Some third-party data platforms offer one after copying your Billtobox data into their own warehouse. Flowplane talks to the Billtobox API directly, so there is nothing to install or host.

Try it

Things to ask

  • “Which purchase invoices of Bakkerij Peeters are still unpaid, and when are they due?”
  • “Show the sales invoices we sent in October, with what is still open on each.”
  • “Which client companies can I see in Billtobox?”
  • “Find the supplier with VAT number BE0123456789 and list its invoices this year.”
Your assistant

Connect your assistant to Billtobox

One Flowplane address works in every assistant below, with the same rules and the same log. Step-by-step setup for each:

FAQ

Questions

Can the assistant change anything in Billtobox?
No, on purpose. Billtobox’s API can also upload invoices, mark them paid and change customers and suppliers, but those touch a company’s books and its accountant’s work, so they are not offered. Every tool only reads.
Can it open the PDF of an invoice?
No. The PDF and UBL files of an invoice and the document centre are left out: it sees the numbers, dates, amounts, VAT, status and the parties.
Does it work with the newer Banqup platform?
No. This connector is for Billtobox in Belgium and the Netherlands. The newer Banqup platform has another API and another sign-in.
Which AI assistants can use Billtobox through Flowplane?
Claude, Claude Code, ChatGPT, Cursor, Codex, GitHub Copilot and Mistral Le Chat, and any other client that supports remote MCP servers with sign-in. They all reach Billtobox through the same Flowplane address.
What does it cost?
Free for one person, with up to three apps and five assistants. Personal Pro is €9 a month including VAT; companies start at €99 a month for ten active users. Prices are indicative; see the pricing page.

Flowplane is not affiliated with or endorsed by Billtobox’s maker; the name and logo only identify the app. Pricing

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