{
  "endpoint": "cancelInvoice",
  "description": "Unbekannte Rueckgabe-Wahl beim Vollstorno",
  "request": {
    "idempotencyKey": "ex-16",
    "invoiceId": "invoice_example",
    "reason": "return",
    "returnDisposition": "lost"
  },
  "expected": {
    "ok": false,
    "code": "validation",
    "fields": [
      "returnDisposition"
    ]
  }
}