const options = {method: 'GET'};

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

[
  {
    "key": "<string>",
    "displayName": "<string>",
    "source": "<string>"
  }
]