Allows to override a price of an item in the shopping cart.
The overridden price will be correctly processed by the discount and tax engines.
Usage example:
public function subscribeEvents()
{
Backend::$events->addEvent('shop:onGetCartItemPrice', $this, 'get_cart_price');
}
public function get_cart_price($cart_item)
{
if ($cart_item->product->sku == '26268880')
return 10;
}