1. Buka script.google.com → Klik Proyek Baru.

2. Hapus isinya, lalu tempel kode berikut:

function doPost(e) {
  var data = JSON.parse(e.postData.contents);
  var folderName = "Authenticator Vault";
  var folders = DriveApp.getFoldersByName(folderName);
  var folder = folders.hasNext() ? folders.next() : DriveApp.createFolder(folderName);
  var files = folder.getFilesByName("authenticator_vault_backup.json");
  if (files.hasNext()) {
    files.next().setContent(JSON.stringify(data, null, 2));
  } else {
    folder.createFile("authenticator_vault_backup.json", JSON.stringify(data, null, 2));
  }
  return ContentService.createTextOutput(JSON.stringify({success:true})).setMimeType(ContentService.MimeType.JSON);
}

3. Klik Deploy → New Deployment. Pilih jenis Web App, ubah Who has access menjadi Anyone, lalu salin URL Web App ke kolom di atas.