Integrate your ERP with OneInvoice

One host for every country. Create invoices, submit them to the network or the tax authority, read their status and documents, handle received invoices, and pull reports — with an API key issued in the portal (Administration → Integration).

Developer guide

Authentication, conventions, the lifecycle, every resource with request and response examples, country specifics, quick start. Download as Markdown to share with an integrator.

Swagger reference

Every endpoint with its parameters and schemas. Authorize with your X-Api-Key and try calls in the browser.

OpenAPI 3 document

Import into Postman, Insomnia or a code generator.

Base URL https://api.oneinvoice.com/v1 · Errors are application/problem+json · Send Idempotency-Key on every POST.