/v1/create/xrechnungXRechnung 3.0 JSON to UBL or CII with Leitweg-ID.
| Name | Type | Required | Description |
|---|---|---|---|
| X-API-Key | string | yes | Your workspace secret. |
| Name | Type | Required | Description |
|---|---|---|---|
| invoice | object | yes | Includes buyerReference / Leitweg-ID. |
| options.syntax | string | no | ubl | cii |
Errors use application/problem+json with type, title, status, detail, errorCode, and optional invalid-params for Schematron field failures.