I am wondering how I can add a google tracking on MemberPress "Thank You" page, basically after a user had paid a monthly or recurring payment and then it will send the data to google analytics with "the name of the plan which they bought", "the payment amount" and "transaction id".
I got this code but its not triggering anything or maybe this is not the right code? I don't know how to debug MemberPress so I am having problems, anyone please help...
function echo_mepr_tracking_script() {
  if(isset($_GET['membership']) && isset($_GET['trans_num'])) {
    $txn = MeprTransaction::get_one_by_trans_num($_GET['trans_num']);
    
    
    if(isset($txn->id) && $txn->id > 0) {
      $trans_id = $txn->id;
      $total = $txn->total;
      // Update total if recurring
      if($txn->subscription_id > 0) {
        $sub = new MeprSubscription($txn->subscription_id);
        if(isset($sub->id) && $sub->id > 0) {
          $trans_id = $sub->id; // Use subscription ID as the payment id for recurring subscriptions
          //Trial period?
          if($sub->trial) {
            $total = $sub->trial_amount;
          } else {
            $total = $sub->total;
            
          }
          
        }
        
      }
      ?>
        <script>
          var fh5coMeprTxnNum = '<?php echo urlencode($trans_id); ?>';
          var fh5coMeprTxnAmount = '<?php echo floatval($total); ?>';
          fbq('track', 'Purchase', {currency: "USD", value: fh5coMeprTxnAmount});
          ga('require', 'ecommerce');
          ga('ecommerce:addTransaction', {
            'id': fh5coMeprTxnNum,
            'revenue': fh5coMeprTxnAmount
          });
          ga('ecommerce:send');
          alert('yes');
        </script>
      <?php
    }
  }
}
add_action('wp_footer', 'echo_mepr_tracking_script');