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Текстовая опция в товаре, как прибавить к стоимости?

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Здравствуйте, у меня такая проблема. Есть сайт на Opencart в нем у товаров есть текстовая опция "калькулятор". Как сделать чтобы при добавлении товара с этой опцией в корзину, заполненое значение прибавлялось к стоимости товара. Нашел что нужно копать в system\library\cart.php


137 строка:

} elseif ($option_query->row['type'] == 'text' || $option_query->row['type'] == 'textarea' || $option_query->row['type'] == 'file' || $option_query->row['type'] == 'date' || $option_query->row['type'] == 'datetime' || $option_query->row['type'] == 'time') {
$option_data[] = array(
'product_option_id'       => $product_option_id,
'product_option_value_id' => '',
'option_id'               => $option_query->row['option_id'],
'option_value_id'         => '',
'name'                    => $option_query->row['name'],
'option_value'            => $option_value,
'type'                    => $option_query->row['type'],
'quantity'                => '',
'subtract'                => '',
'price'                   => '',
'price_prefix'            => '',
'points'                  => '',
'points_prefix'           => '', 
'weight'                  => '',
'weight_prefix'           => ''

пробовал сюда в массив добавлять в значение price любую цифру и в prefix ставил "плюс", но она не добавляется к стоимости товара в корзине.

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