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Go to script.google.com and click New project.
Delete all existing code. Copy and paste the code below into the editor, then press Ctrl+S.
Click Deploy → New deployment → click the ⚙️ gear → select Web app.
Set Execute as: Me and Who has access: Anyone. Click Deploy and authorize when prompted.
Copy the Web app URL shown after deployment. Paste it into the ⚡ Apps Script URL field in the Dashboard and click 💾 Save.