const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({code: '<string>'})
};

fetch('https://api.dolfinai.co/auth/exchange', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "token": "<string>",
  "userId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "email": "<string>",
  "organisations": [
    {
      "organisationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "organisationName": "<string>"
    }
  ],
  "clients": [
    {
      "clientId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "clientName": "<string>"
    }
  ]
}