E-Rechnung im Produkt – ohne die Dauerpflege im eigenen Backlog.

POST /api/v1/invoices/atomic/ HTTP/1.1
Host: console.factora.software
Authorization: Bearer fa_test_...
Idempotency-Key: 8f14e45f-ea6b-4f1d-9a1e-3b0f2c7d1a55
Content-Type: application/json

{
  "api_mode": "atomic_single_post",
  "invoice_header": {
    "invoice_number": "RE-2026-0042",
    "invoice_date": "2026-03-25",
    "buyer_reference": "PO-2026-001"
  },
  "validation_totals": {
    "net_amount": "1200.00",
    "vat_amount": "228.00",
    "gross_amount": "1428.00"
  },
  "seller_snapshot": {
    "name": "Muster GmbH",
    "street": "Musterstr. 1",
    "zip": "10115",
    "city": "Berlin",
    "country": "DE",
    "vat_id": "DE123456789",
    "iban": "DE89370400440532013000",
    "contact": {
      "name": "E. Musterfrau",
      "phone": "+49 30 1234567",
      "email": "rechnung@muster.example"
    }
  },
  "buyer": {
    "name": "Kunde AG",
    "street": "Kundenweg 2",
    "zip": "20095",
    "city": "Hamburg",
    "country": "DE",
    "contact": { "email": "einkauf@kunde.example" }
  },
  "items": [
    {
      "description": "Beratungsleistung",
      "quantity": "10.000",
      "unit": "HUR",
      "unit_price_net": "120.00",
      "vat_rate": "19.00"
    }
  ]
}

HTTP/1.1 200 OK

{
  "valid": true,
  "data": {
    "id": null,
    "invoice_number": "RE-2026-0042",
    "status": "sandbox",
    "total": "1428.00",
    "message": "Sandbox-Vorschau — validiert und generiert, nichts gespeichert. Dokumentbytes liefert nur der Live-Key."
  },
  "errors": [],
  "meta": { "sandbox": true }
}