// Protect a document with Vertifile
const form = new FormData();
form.append('file', fileBuffer);

const res = await fetch('https://vertifile.com/api/create-pvf', {
  method: 'POST',
  headers: { 'X-API-Key': 'YOUR_API_KEY' },
  body: form
});

const pvfFile = await res.blob();