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

fetch('https://api.k0rdent.ai/v1/regions/global/iam/groups/{groupId}/members/{id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "error": {
    "code": 123,
    "message": "<string>",
    "details": [
      {}
    ]
  }
}