Creating a subscription when an event occurs in a team project using javascript

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Javascript

VSTS

I want to create a service hook subscription for team projects on time of creation. I have tried REST API method, but it needs additional authentication even though I signed in VSTS.

Can anyone please help me?

What I have tried:

I have tried REST API:

{
"publisherId": "tfs",
"eventType": " workitem.created",
"resourceVersion": "1.0",
"consumerId": "webHooks",
"consumerActionId": "httpRequest",
"publisherInputs": {
“areaPath”: “MyProject”,

"projectId": "my project id"
},
"consumerInputs": { "url": "my azure url" },
}