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

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

{
  "name": "<string>",
  "currency": "<string>",
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "organisationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "description": "<string>",
  "unitPrice": 123,
  "createdAt": "2023-11-07T05:31:56Z",
  "createdBy": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "updatedAt": "2023-11-07T05:31:56Z",
  "updatedBy": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}