curl https://api.mercozy.com/api/v1/external/products \
  -H "X-API-Key: mk_live_your_key_here"

https://api.mercozy.com/api/v1/external

{
  "data": [
    {
      "id": "prod_abc123",
      "name": "Premium Widget",
      "price": 2999,
      "currency": "USD"
    }
  ],
  "meta": {
    "total": 42,
    "page": 1,
    "limit": 20
  }
}

{
  "statusCode": 401,
  "message": "Invalid API key",
  "error": "Unauthorized"
}