Get value of an order by brand or company

I am developing a module to receive commissions from companies that are selling in my magento store. This is already working, however, I need to add a new function that I am not getting.

I need to add an extra amount to the commission, if the request of any company is greater than "X" I did it in a way that did not work:

foreach($order->getAllVisibleItems() as $key => $item){
               $product = Mage::getModel('catalog/product')->load($item->getProductId());
               $price = $item->getPrice();
               $valor_comissao = (int)$product->getAttributeText('comissao_vendedor')/100;
               $comissao_valor2 = $price-($price*$valor_comissao);
               $qty = $item->getQtyOrdered();
               $valor_pedido = ($price*$qty);

               if($valor_pedido > 150) {
                 $comissao_valor = ($comissao_valor2*$qty-17);
               } else {
                  $comissao_valor=($comissao_valor2*$qty-2);
               }
               $comissoes[] = array (
                                                    'Razao' => 'Produto '.$item->getName().' id '.$item->getProductId().' x '.$item->getQtyToInvoice().' sku: '. $item->getSku(),
                                                    'Login' => $product->getAttributeText('login'),
                                                    'ValorFixo' => $comissao_valor
                                                );
    }

In this way, only if the product goes over $ 150.00 that the value is added and if you have 2 products of the same brand costing $ 100.00, the value is not added. I need the value to be added if the entire order for the brand exceeds $ 150.00.

The logic I'm trying to follow is as follows:

  

• get total order value;

  

• Filter by tags, that is, total order value per brand;

  

• If the product is of a mark that has exceeded the value "x" and it has not yet received the additional value, add freight.