const response = await fetch('https://service.pcibooking.net/api/resources/stylesheet/DefaultCSS', {
  headers: {
    'Authorization': 'APIKEY your-api-key'
  }
});

const cssRecord = await response.json();
console.log(cssRecord);

import requests

response = requests.get(
    'https://service.pcibooking.net/api/resources/stylesheet/DefaultCSS',
    headers={
        'Authorization': 'APIKEY your-api-key'
    }
)

css_record = response.json()
print(css_record)

{
    "ResourceName": "DefaultCSS",
    "Description": "The default CSS",
    "ContentLTR": "body { background-color: powderblue; } h1 { color: blue; }",
    "ContentRTL": "",
    "IsDefault": true,
    "ContentType": "text/css"
}

// Empty body. The specified ResourceName does not exist in your account.

{
    "code": -1003,
    "message": "Not authorized to access this resource",
    "moreInfo": "Bad or missing authorization data, expected APIKEY",
    "errorList": null
}