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REST API

Send a document, get structured JSON back. For firms and software vendors who want the reading engine inside their own tools.

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The REST API is live. It gives software vendors and larger firms the same reading engine that powers the Invoreg workspace, without the workspace. You send a supplier invoice as a PDF or image; you get back header fields and line items as JSON, including VAT per line and the AI's confidence flags. Contact us for documentation and keys.

How it works

  1. Request API access. We issue keys for a test organisation and share the endpoint documentation.
  2. Your software sends a document (PDF, JPG, PNG or HEIC) to the endpoint with your key.
  3. Invoreg reads the header and every line item and returns JSON: supplier details, invoice number, invoice and due dates, currency, net, VAT and gross totals, and an array of lines with description, quantity, unit price, VAT rate and VAT amount.
  4. Each field carries a confidence flag. Your application decides what to accept automatically and what to show a person for checking.
  5. Optionally, documents can also be pushed into an Invoreg organisation so duplicate flagging, approvals and the accounting connector run on them as usual.

Good to know

  • Output is JSON. Confidence flags are per field, not per document, so a clear total with an unclear supplier address is handled sensibly.
  • Accepted inputs: PDF (single or multi-page), JPG, PNG and HEIC. Scans and phone photos are read the same way as digital PDFs.
  • Processing happens in the EU. A data processing agreement is available.
  • Keys are issued per organisation, so a vendor serving several clients keeps their documents separate.
  • Pricing follows the same per-invoice model as the workspace; see the pricing page.

Questions

Can I use the API without the Invoreg workspace? Yes. Many vendors only need the JSON and handle review in their own interface.

Does the API post to your accounting software? Not directly. Posting is done by the accounting connectors inside a workspace organisation. Send documents into an organisation if you want both reading and posting.

Is there a sandbox? Yes. Your test organisation includes free reads so you can integrate before paying.

Get access

Tell us what you are building and the volume you expect. Ask for API documentation and keys.

Updated 2026-09-25

Questions accountants ask

A JSON document with the header fields (supplier, invoice number, dates, currency, net, VAT and gross totals) and an array of line items, each with description, quantity, unit price, VAT rate and VAT amount. Every field carries a confidence flag so your software knows what to show for checking.

PDF, JPG, PNG and HEIC, including multi-page PDFs and phone photos of paper invoices. Send the file itself, not a link. Very large scans are accepted but take longer; we suggest keeping files under a few megabytes per page for the fastest turnaround.

On Invoreg infrastructure in the European Union. Documents sent through the API are processed and stored within the EU, and a data processing agreement is available. Retention is agreed when keys are issued; ask during the demo if your product needs a specific retention period.