Check CDN endpoint namespace availability

curl --request GET \
  --url https://convertly.sh/api/cdn-delivery-sources \
  --header 'Authorization: Bearer <token>'

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://convertly.sh/api/cdn-delivery-sources', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "error": "<string>",
  "upgradeUrl": "<string>"
}