API למסמכים שפשוט עובד

const BASE = 'https://api.billos.co.il/v1'
const headers = { 'X-Api-Key': process.env.BILLOS_KEY, 'Content-Type': 'application/json', 'Idempotency-Key': 'order-8812' }

const { document } = await fetch(`${BASE}/businesses/${bid}/documents`, {
  method: 'POST', headers,
  body: JSON.stringify({
    docType: 320, priceMode: 'gross',
    party: { name: 'דנה לוי', phone: '0521111111' },
    lines: [{ description: 'איפור ערב', quantity: 1, unitPriceExVat: 35000 }],
    payments: [{ method: 3, amount: 35000 }],
  }),
}).then((r) => r.json())

const issued = await fetch(`${BASE}/businesses/${bid}/documents/${document.id}/issue`, { method: 'POST', headers }).then((r) => r.json())
console.log(issued.document.docNumber)   // 1042

curl -X POST $BASE/businesses/$BID/documents \
  -H "X-Api-Key: $KEY" -H "Idempotency-Key: order-8812" \
  -d '{ "docType": 320, "priceMode": "gross",
       "party": { "name": "דנה לוי", "phone": "0521111111" },
       "lines": [{ "description": "איפור ערב", "quantity": 1, "unitPriceExVat": 35000 }],
       "payments": [{ "method": 3, "amount": 35000 }] }'

curl -X POST $BASE/businesses/$BID/documents/$DOC/issue -H "X-Api-Key: $KEY"

import os, requests
API = "https://api.billos.co.il/v1"; H = {"X-Api-Key": os.environ["BILLOS_KEY"], "Idempotency-Key": "order-8812"}
doc = requests.post(f"{API}/businesses/{bid}/documents", headers=H, json={
    "docType": 320, "priceMode": "gross",
    "party": {"name": "דנה לוי", "phone": "0521111111"},
    "lines": [{"description": "איפור ערב", "quantity": 1, "unitPriceExVat": 35000}],
    "payments": [{"method": 3, "amount": 35000}],
}).json()["document"]
issued = requests.post(f"{API}/businesses/{bid}/documents/{doc['id']}/issue", headers=H).json()
print(issued["document"]["docNumber"])   # 1042