Item Add (HTML/CSS/JS + Google Apps Script) Sheets setup Create Google Sheet (e.g., NewBazarHisab) Sheet "Items" with header in A1: Item Get Spreadsheet ID and set it inside AppsScript.gs Apps Script Paste AppsScript.gs into Extensions → Apps Script Set SPREADSHEET_ID Deploy as Web App (Execute as: Me; Who has access: Anyone with the link) Copy Web App URL Frontend Set WEB_APP_URL in config.js Open index.html (preferably via http://localhost using a simple static server)