Intégrer FacturX API avec Node.js

import { createHash } from 'node:crypto';

// FACTURX_OPERATION_KEY_START
function facturxOperationKey(output: string, target: string, invoiceJson: string, fileDigest = ''): string {
  const operationIdentity = createHash('sha256')
    .update([output, target, invoiceJson, fileDigest].join('\0'))
    .digest('hex');
  return `convert-${operationIdentity}`;
}
// FACTURX_OPERATION_KEY_END

const invoiceData = {
  "invoice_number": "FA-2026-042",
  "issue_date": "2026-04-01",
  "invoice_type": "380",
  "currency": "EUR",
  "seller": {
    "name": "Ma Societe SAS",
    "siret": "10000000900017",
    "vat_id": "FR88100000009",
    "address": {
      "street": "10 rue de Rivoli",
      "city": "Paris",
      "postal_code": "75001",
      "country": "FR"
    }
  },
  "buyer": {
    "name": "Client SA",
    "siret": "10000001700010",
    "address": {
      "street": "20 rue de la Republique",
      "city": "Lyon",
      "postal_code": "69002",
      "country": "FR"
    }
  },
  "references": {
    "buyer_reference": "SERVICE-ACHATS",
    "purchase_order_reference": "PO-2026-0017",
    "contract_reference": "CTR-2026-04"
  },
  "totals": {
    "net": "970.00",
    "tax": "194.00",
    "gross": "1164.00",
    "prepaid_amount": "100.00",
    "rounding_amount": "0.00",
    "due": "1064.00"
  },
  "tax_breakdown": [
    {
      "rate": "20.00",
      "category": "S",
      "base": "970.00",
      "amount": "194.00"
    }
  ],
  "line_items": [
    {
      "number": "1",
      "description": "Prestation conseil",
      "quantity": "10",
      "unit": "C62",
      "unit_price": "100.00",
      "net_amount": "970.00",
      "vat_rate": "20.00",
      "vat_category": "S",
      "purchase_order_line_reference": "10",
      "gross_unit_price": "120.00",
      "price_discount": "20.00",
      "allowances": [
        {
          "amount": "50.00",
          "reason": "Remise ligne",
          "reason_code": "95"
        }
      ],
      "charges": [
        {
          "amount": "20.00",
          "reason": "Supplement urgent"
        }
      ]
    }
  ],
  "payment": {
    "due_date": "2026-05-01",
    "terms": "Paiement a 30 jours",
    "iban": "FR7630006000011234567890189"
  },
  "delivery": {
    "date": "2026-04-01",
    "address": {
      "street": "20 rue de la Republique",
      "city": "Lyon",
      "postal_code": "69002",
      "country": "FR"
    }
  },
  "invoicing_period": {
    "start_date": "2026-04-01",
    "end_date": "2026-04-30"
  }
} as const;
const output = 'facturx_pdfa3';
const validationTarget = 'en16931';
const invoiceJson = JSON.stringify(invoiceData);
const idempotencyKey = facturxOperationKey(output, validationTarget, invoiceJson);

const response = await fetch('https://api.facturxapi.com/api/v1/convert', {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.FACTURX_API_KEY}`,
    'Accept-Language': 'fr',
    'Idempotency-Key': idempotencyKey
  },
  body: await (async () => {
    const form = new FormData();
    form.append('output', output);
    form.append('validation_target', validationTarget);
    form.append('invoice_data', invoiceJson);
    return form;
  })()
});

const payload = await response.json();
if (!payload.success) {
  console.error('Conversion non vérifiée', payload.target, payload.issues);
}