Conectamos con lo que tu pyme
ya está usando.

# Crea un pedido desde tu integración custom
curl -X POST https://api.expandepro.cl/v1/orders \
  -H "Authorization: Bearer $EXPANDEPRO_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: order_8742" \
  -d '{
    "channel": "custom-app",
    "customer": { "rut": "12345678-9" },
    "items": [
      { "sku": "PL-001", "qty": 2 }
    ]
  }'

HTTP/1.1 200 OK
x-ratelimit-remaining: 11.842
x-response-time: 84ms

{
  "id": "ord_8b3F2",
  "status": "paid",
  "dte": { "folio": 28471, "type": "boleta_39" },
  "total": 42900
}