Menu.js

/**
 * Copyright 2022 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @OnlyCurrentDoc
 *
 * The above comment specifies that this automation will only
 * attempt to read or modify the spreadsheet this script is bound to.
 * The authorization request message presented to users reflects the
 * limited scope.
 */

/**
 * Creates a custom menu in the Google Sheets UI when the document is opened.
 *
 * @param {object} e The event parameter for a simple onOpen trigger.
 */
function onOpen(e) {

const menu = SpreadsheetApp.getUi().createMenu(APP_TITLE)
  menu
    .addItem('Process invoices', 'processDocuments')
    .addItem('Send emails', 'sendEmails')
    .addSeparator()
    .addItem('Reset template', 'clearTemplateSheet')
    .addToUi();
}