const options = {
  method: 'PATCH',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({})
};

fetch('https://api.dolfinai.co/clients/{clientId}/members/{userId}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "userId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "email": "<string>",
  "joinedAt": "2023-11-07T05:31:56Z",
  "name": "<string>"
}