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Set TELEGRAM_WEBHOOK_SECRET explicitly.\",\n );\n}\n\n// Best-effort in-memory cache; may reset on cold starts (that's fine).\nlet webhookConfiguredForUrl: string | null = null;\n\nasync function telegramApi(\n method: string,\n body: Record,\n): Promise {\n const url = `${TELEGRAM_API_BASE}${BOT_TOKEN}/${method}`;\n\n const response = await fetch(url, {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify(body),\n });\n\n if (!response.ok) {\n throw new Error(`Telegram API HTTP ${response.status} on ${method}`);\n }\n\n const data = (await response.json()) as TelegramApiResponse;\n\n if (!data.ok) {\n throw new Error(\n `Telegram API error on ${method}: ${data.description ?? \"Unknown error\"}`,\n );\n }\n\n return data.result as T;\n}\n\nasync function ensureWebhook(url: string): Promise {\n if (webhookConfiguredForUrl === url) return;\n\n // Telegram supports secret_token and will echo it back in a request header.\n await telegramApi(\"setWebhook\", {\n url,\n secret_token: WEBHOOK_SECRET,\n allowed_updates: [\"message\"],\n });\n\n webhookConfiguredForUrl = url;\n}\n\nasync function getRandomDuckUrl(): Promise {\n const response = await fetch(DUCK_API_URL);\n if (!response.ok) {\n throw new Error(`Duck API HTTP ${response.status}`);\n }\n\n const data = (await response.json()) as DuckApiResponse;\n if (!data.url) {\n throw new Error(\"Duck API returned no URL\");\n }\n\n return data.url;\n}\n\nasync function sendPhoto(chatId: number, photoUrl: string): Promise {\n await telegramApi(\"sendPhoto\", {\n chat_id: chatId,\n photo: photoUrl,\n caption: \"🦆 Quack!\",\n });\n}\n\nasync function handleUpdate(update: TelegramUpdate): Promise {\n const message = update.message;\n if (!message?.text) return;\n\n const chatId = message.chat.id;\n const text = message.text.trim();\n\n if (text === \"/duck\" || text.startsWith(\"/duck@\")) {\n const duckUrl = await getRandomDuckUrl();\n await sendPhoto(chatId, duckUrl);\n }\n}\n\nexport default async function (req: Request): Promise {\n try {\n // Auto-register webhook on first request (or after a cold start)\n // This matches the Val Town Telegram guide pattern.\n await ensureWebhook(req.url);\n\n if (req.method !== \"POST\") {\n return new Response(\"Duck Bot is running! 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