ValidateJsonResponse

{
    "status": "success",
    "input": "json",
    "invoice_number": "RE-2026-VAL-001",
    "document_format": "xrechnung_ubl",
    "validation": {
        "valid": true,
        "errors": [
            {
                "source": "request",
                "message": "[BR-DE-15] Das Element \"Buyer reference\" (BT-10) muss übermittelt werden.",
                "code": "BR-DE-15",
                "location": "/ubl:Invoice[1]",
                "severity": "fatal"
            }
        ]
    },
    "xml": "string",
    "pdf_base64": "string"
}