const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    description: '<string>',
    effectiveFrom: '2023-11-07T05:31:56Z',
    effectiveUntil: '2023-11-07T05:31:56Z'
  })
};

fetch('https://sandbox.api.enfinitos.com/v1/rights/bases', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "ok": true,
  "data": {
    "basis": {
      "id": "<string>",
      "orgId": "<string>",
      "description": "<string>",
      "effectiveFrom": "2023-11-07T05:31:56Z",
      "effectiveUntil": "2023-11-07T05:31:56Z",
      "contentHash": "<string>",
      "createdAt": "2023-11-07T05:31:56Z"
    }
  },
  "contractVersion": "<string>"
}