function main() {
  // Performance Metrics
  var targetCPA = 30; // Your desired cost per acquisition
  var minConversions = 10; // Minimum conversions for reliable data

  // Timeframe: Analyze recent performance with flexibility
  var dateRange = "LAST_30_DAYS"; 

  // Campaign Selection 
  var campaignName = "Campaign Name"; 

  // Get relevant keywords
  var keywordIterator = AdsApp.campaigns()
      .withCondition("Name = '" + campaignName + "'")
      .get()
      .keywords();

  while (keywordIterator.hasNext()) {
    var keyword = keywordIterator.next();

    // Gather keyword performance data
    var stats = keyword.getStatsFor(dateRange);
    var conversions = stats.getConversions();
    var cost = stats.getCost();
    var currentCPA = cost / conversions;

    // Apply Bid Adjustments Only If Data is Sufficient 
    if (conversions >= minConversions) {
      if (currentCPA > targetCPA) {
        // Decrease bid if CPA is higher than target
        var newBid = keyword.getMaxCpc() * 0.9; // Example: Reduce by 10%
        keyword.setMaxCpc(newBid);
      } else if (currentCPA < targetCPA) {
        // Increase bid if CPA is lower than target
        var newBid = keyword.getMaxCpc() * 1.1; // Example: Increase by 10%
        keyword.setMaxCpc(newBid);
      }
    } 
  }
}