curl --request DELETE \
  --url https://api.upag.io/v1/invoices/{invoiceId}/items/{itemId} \
  --header 'Authorization: Bearer <token>'

const options = {method: 'DELETE', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.upag.io/v1/invoices/{invoiceId}/items/{itemId}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

const url = 'https://api.upag.io/v1/invoices/{invoiceId}/items/{itemId}';
const options = {method: 'DELETE', headers: {Authorization: 'Bearer <token>'}};

fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));