Extraire une donnée structurée avec Go

import os, requests

API = os.environ["RETRIEVER_API_URL"]
HEADERS = {"Authorization": f"Bearer {os.environ['RETRIEVER_API_KEY']}"}

res = requests.post(f"{API}/v1/go/run", headers=HEADERS, timeout=180, json={
    "query": "Dernière levée de fonds de Qonto : montant, date, investisseurs principaux.",
    "instructions": "Croise au moins deux sources fiables. Donne les URL sources.",
    "model": "fast",
    "output_schema": {
        "type": "object",
        "required": ["amount_eur", "date", "investors", "sources"],
        "properties": {
            "amount_eur": {"type": ["number", "null"]},
            "date": {"type": ["string", "null"]},
            "investors": {"type": "array", "items": {"type": "string"}},
            "sources": {"type": "array", "items": {"type": "string"}},
        },
    },
})
body = res.json()
if not res.ok:
    raise RuntimeError(f"{res.status_code} {body['error']['code']}: {body['error']['message']}")
print(body["value"], "crédits :", body["usage"]["credits"]["total"])