Block Telegram Webhook Spoofing and Duplicate Updates in Pure PHP

<p>Imagine setting up a Telegram bot for order processing or lead capture. You deploy a public script named <code>webhook.php</code>, register its public URL with Telegram, and handle incoming user interaction. Without authentication and idempotency, this simple endpoint creates major production vulnerabilities. Anyone who discovers or guesses your public endpoint URL can send forged HTTP POST req

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