osCommerce

      //--------------------------------------------------------------------------
       // integration code
       //--------------------------------------------------------------------------
       // get order id
       $sql = "select orders_id from ".TABLE_ORDERS.
              " where customers_id='".(int)$customer_id.
              "' order by date_purchased desc limit 1";
       $pap_orders_query = tep_db_query($sql);
       $pap_orders = tep_db_fetch_array($pap_orders_query);
       $pap_order_id = $pap_orders['orders_id'];
    
       // get total amount of order
       $sql = "select value from ".TABLE_ORDERS_TOTAL.
              " where orders_id='".(int)$pap_order_id.
              "' and class='ot_subtotal'";
       $pap_orders_total_query = tep_db_query($sql);
       $pap_orders_total = tep_db_fetch_array($pap_orders_total_query);
       $pap_total_value = $pap_orders_total['value'];
    
       //get product ids
        $sql = "select products_id from " .TABLE_ORDERS_PRODUCTS.
              " where orders_id=".(int)$pap_order_id;
        $pap_orders_products_query = tep_db_query($sql);
        $pap_orders_products = '';
        while ($row = tep_db_fetch_array($pap_orders_products_query)) {
            $pap_orders_products .= $row['products_id'] . ',';
        }
        $pap_orders_products = substr($pap_orders_products, 0, -1);
    
       // draw invisible image to register sale
       if($pap_total_value != "" && $pap_order_id != "")
       {
          print '<script id="pap_x2s6df8d" src="https://URL_TO_PostAffiliatePro/scripts/trackjs.js" type="text/javascript"></script>
    '."<script type=\"text/javascript\">PostAffTracker.setAccountId('Account_ID');
    var sale = PostAffTracker.createSale();
    sale.setTotalCost('$pap_total_value');
    sale.setOrderID('$pap_order_id');
    sale.setProductID('$pap_orders_products');
    
    PostAffTracker.register();
    </script>";
       }
       //--------------------------------------------------------------------------
       // END of integration code
       //--------------------------------------------------------------------------

    //--------------------------------------------------------------------------
       // integration code
       //--------------------------------------------------------------------------
       // get order id
       $sql = "select orders_id from ".TABLE_ORDERS.
              " where customers_id='".(int)$customer_id.
              "' order by date_purchased desc limit 1";
       $pap_orders_query = tep_db_query($sql);
       $pap_orders = tep_db_fetch_array($pap_orders_query);
       $pap_order_id = $pap_orders['orders_id'];
    
        //get variables for script
        $sql = "select products_id,products_price,products_quantity from " .TABLE_ORDERS_PRODUCTS.
              " where orders_id=".(int)$pap_order_id;
        $pap_products_total_query = tep_db_query($sql);
        $k = 0;
        while ($row = tep_db_fetch_array($pap_products_total_query)) {
            $pap_products_total[$k+1] = $row['products_price'] * $row['products_quantity'];
            $pap_products[$k+1] = $row['products_id'];
            $k++;
        }
    
        // draw invisible image to register sale
        if($pap_order_id != "")
        {
    
        ?>
        <script id="pap_x2s6df8d" src="https://URL_TO_PostAffiliatePro/scripts/trackjs.js" type="text/javascript"></script>
        <script type="text/javascript">
     PostAffTracker.setAccountId('Account_ID');    <?php
         for ($j=1; $j<=$k; $j++){
          echo "var sale".$j." = PostAffTracker.createSale();\n".
               "sale".$j.".setTotalCost('". $pap_products_total[$j]."');\n".
               "sale".$j.".setOrderID('".$pap_order_id."');\n".
               "sale".$j.".setProductID('".$pap_products[$j]."');\n\n";
         }
        ?>
        
        PostAffTracker.register();
        </script>;
        <?php
        }
       //--------------------------------------------------------------------------
       // END of integration code
       //--------------------------------------------------------------------------

    } else {
        reset($parameters);
        while (list($key, $value) = each($parameters)) {
          $process_button_string .= tep_draw_hidden_field($key, $value);
        }
     }
    
      return $process_button_string;

    } else {
            reset($parameters);
            while (list($key, $value) = each($parameters)) {
              if ($key == "custom") {
                $tofix = tep_draw_hidden_field($key, $value);
                $process_button_string .= substr($tofix,0,-1) .' id="pap_ab78y5t4a" >';
              }
              else {
                $process_button_string .= tep_draw_hidden_field($key, $value);
              }
            }
          }
    
          $process_button_string .= '<script type="text/javascript">';
          $process_button_string .= 'document.write(unescape("%3Cscript id=%27pap_x2s6df8d%27 src=%27" + (("https:" == document.location.protocol) ? "https://" : "http://") + "URL_TO_PostAffiliatePro/scripts/trackjs.js%27 type=%27text/javascript%27%3E%3C/script%3E"));';
          $process_button_string .= '</script><script type="text/javascript">PostAffTracker.setAccountId(\'default1\');';
          $process_button_string .= 'PostAffTracker.setAppendValuesToField(\'||\');';
          $process_button_string .= 'PostAffTracker.writeCookieToCustomField(\'pap_ab78y5t4a\');</script>';
    
          return $process_button_string;

     $ch = curl_init();
     curl_setopt($ch, CURLOPT_URL, "https://URL_TO_PostAffiliatePro/plugins/PayPal/paypal.php");
     curl_setopt($ch, CURLOPT_POST, 1);
     curl_setopt($ch, CURLOPT_POSTFIELDS, $_POST);
     curl_exec($ch);

    $separator = '||';
        if ($_POST['custom'] != '') {
          $explodedCustomValue = explode($separator, $_POST['custom'], 2);
              if (count($explodedCustomValue) == 2) {
                $_REQUEST['custom'] = $_POST['custom'] = $explodedCustomValue[0];
                $HTTP_POST_VARS['custom'] = $explodedCustomValue[0];
          }
        }