Help needed with custom payment module

[etrader]

I ported a Westpac WebAdvantage payment module from oscommerce and there is just one small problem with it.

If I purchase more than one of the same product with different attributes, the payment module only charges for one product.

This must have something to do with how product with attribute's quantities are calculated.

Can someone tell what needs to be changed in this function to fix the problem?

<?php 
      function process_button() {
      global $order, $currencies, $currency;
      $tax_rate = 0;
      $process_button_string = zen_draw_hidden_field('vendor_name', MODULE_PAYMENT_WEBADVANTAGE_MERCHANT_ID) .
                               zen_draw_hidden_field('payment_alert', MODULE_PAYMENT_WEBADVANTAGE_MERCHANT_EMAIL) . 
                               zen_draw_hidden_field('print_zero_qty', 'false');
                               
      foreach($order->products as $key => $value) {

        if($value['tax']>0) {
          $process_button_string .= zen_draw_hidden_field($value['name'], $value['qty'].','.$value['final_price']);
          $tax_rate = $value['tax'];
        } else {
          $process_button_string .= zen_draw_hidden_field($value['name'] . ' *', $value['qty'].','.$value['final_price']);
          $process_button_string .= zen_draw_hidden_field('gst_exempt_fields', $value['name'] . ' *');
        }
      }

      if($tax_rate > 0) {
        $process_button_string .= zen_draw_hidden_field('gst_rate', $tax_rate);
        $process_button_string .= zen_draw_hidden_field('gst_added', 'false');
        $process_button_string .= zen_draw_hidden_field('gst_exempt_fields', 'Shipping Method: '.$order->info['shipping_method'] . ' *');
      }
      $process_button_string .= zen_draw_hidden_field('Shipping Method: '.$order->info['shipping_method'] . ' *', '1,'.$order->info['shipping_cost']);
      $process_button_string .= zen_draw_hidden_field('receipt_address', $order->customer['email_address']);
      $process_button_string .= zen_draw_hidden_field('return_link_text', 'To Complete Your Order You Must Click Here To Finish Payment and Return to Circus Arts.');
      $process_button_string .= zen_draw_hidden_field('return_link_url', zen_href_link(FILENAME_CHECKOUT_PROCESS,'bank_reference=&payment_number=&remote_ip='));

      return $process_button_string;
    } ?>

[etrader]

I got around this by adding a unique identifier to the product name in tpl_checkout_confirmation.php (around line 160) like this:

<?php $order->products[$i]['name'] = $order->products[$i]['name'] . nl2br(zen_output_string_protected($order->products[$i]['attributes'][$j]['value']));?>


This adds the attribute values to the product name before it is passed to the Westpac web advantage site.

Does anyone know how I can add an id # to the products name instead of the attribute values?