const fetch = require('node-fetch');

let url = 'https://api.coralogix.com/mgmt/openapi/v1/outgoing-webhooks/ibm-event-notifications/instances';

let options = {method: 'GET', headers: {Authorization: 'Bearer <API_KEY>'}};

fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error('error:' + err));

{
  "instances": [
    {
      "instanceId": "5a8b249b-3915-49e7-ad43-030f585d84c5",
      "regionId": "eu-gb",
      "name": "example-name",
      "crn": "crn:v1:staging:public:logs:eu-gb:a/436fa6f7760f46eba99e22f099c33cb8:5a8b249b-3915-49e7-ad43-030f585d84c5::",
      "isUsed": true
    }
  ]
}