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function doPost(e) {
  // Clear any existing cache related to the Rekap message
  CacheService.getScriptCache().remove('rekapMessage');

  // Parse the incoming POST data from PushWA in JSON format
  const body = e.postData.contents;
  const parsedData = JSON.parse(body);

  // Extract relevant data from the parsed JSON
  const device = parsedData.deviceNumber; // The device number that received the message
  const fromNumber = parsedData.from; // The sender's WhatsApp number, e.g., '628123456789'
  const messageBody = parsedData.message ? parsedData.message.trim().toLowerCase() : ''; 
  // Converts the message to lowercase for case-insensitive matching

  // Check if the message body contains the keyword 'Rekap'
  if (messageBody == 'rekap') {
    // Generate the Rekap message
    const rekapMessage = generateRekapMessage(); // This will generate a fresh message every time

    // Send the Rekap message back to the sender
    sendMessagePushWA(fromNumber, rekapMessage);
  }

  const cache = CacheService.getScriptCache();
  cache.remove('rekapMessage'); // Ensure no cached version is being used

  // Prepare and return a JSON response to PushWA
  const res = {
    "message": "Berubah Ga?" // Custom response message
  };

  return ContentService.createTextOutput(JSON.stringify(res)).setMimeType(ContentService.MimeType.JSON);
}