{
  "external_reference": "KUNDE-2026-000123",
  "customer": {
    "number": "",
    "name": "Musterfirma GmbH",
    "contact": "Max Mustermann",
    "role": "Einkauf",
    "phone": "+49 123 456789",
    "email": "max@beispiel.de",
    "address": "Musterstraße 1, 12345 Musterstadt",
    "notes": "Interne Kundenhinweise"
  },
  "due_date": "2026-07-31",
  "status": "Offener Auftrag",
  "mockup": "",
  "items": [
    {
      "product": "Creator 2.0 T-Shirt",
      "sku": "STTU169",
      "supplier": "Stanley/Stella",
      "color": "Black",
      "sizes": {
        "XXS": 0,
        "XS": 0,
        "S": 5,
        "M": 10,
        "L": 8,
        "XL": 4,
        "2XL": 2,
        "3XL": 0,
        "4XL": 0,
        "5XL": 0,
        "152": 0,
        "164": 0
      },
      "needs_purchase": true,
      "placements": [
        "Brust klein links",
        "Rücken groß"
      ],
      "print_dimensions": "Brust 10 × 8 cm; Rücken 28 × 35 cm",
      "production_notes": "Logo auf Brust und Motiv groß auf Rücken",
      "proofs": [
        "data:image/png;base64,BASE64_DATEIINHALT"
      ]
    }
  ]
}