const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({materialIds: ['<string>'], folderId: '<string>'})
};

fetch('https://studyfetchapi.com/api/v1/materials/bulk/move', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "success": true,
  "movedCount": 123
}