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Customer API

The Nuntiq Customer API lets you push invoices into the platform, pull processed results, and manage related resources (suppliers, organizations, attachments, lifecycle events).

This section will cover:

  • Getting started — authentication, base URLs, sandbox vs production.
  • Concepts — invoices, lifecycle messages, attachments, delta streams.
  • API reference — generated from the OpenAPI spec.

The API reference is auto-generated from the live Nuntiq Customer API Swagger spec. Treat anything you see here as the source of truth.

  • Invoice lifecycle code catalog — the full list of code values accepted by POST /v1/invoices/{token}/lifecycle-messages, grouped by tier, with state-transition rules.