2.0.x-2.2.x/upload/catalog/controller/module/facebook_business.php [519:573]:
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        if ($product_to_facebook['google_product_category']) {
            return $product_to_facebook['google_product_category'];
        } else {
            $category = $product_info['category_name'];

            if (!$category) {
                $category = $this->config->get('config_name');
            }
    
            return $this->formatAndTrimString($category);
        }
    }

    private function getBrand($product_info) {
        if ($product_info['manufacturer_name']) {
            $brand = $product_info['manufacturer_name'];
        } else {
            $brand = $this->config->get('config_name');
        }

        return $this->formatAndTrimString($brand);
    }

    private function getPrice($product_info) {
        if ($product_info['tax_class_id']) {
            $price = $this->tax->calculate($product_info['price'], $product_info['tax_class_id'], $this->config->get('config_tax'));
        } else {
            $price = $product_info['price'];
        }

        $price = number_format(round((float)$price, 2), 2, '.', '');
        $price = $price . ' ' . strtoupper($this->config->get('config_currency'));

        return $price;
    }

    private function getSpecialPrice($product_info) {
        if (!empty($product_info['special']) && $this->config->get('facebook_business_sync_specials_status')) {
            if ($product_info['tax_class_id']) {
                $special = $this->tax->calculate($product_info['special'], $product_info['tax_class_id'], $this->config->get('config_tax'));
            } else {
                $special = $product_info['special'];
            }

            $special = number_format(round((float)$special, 2), 2, '.', '');
            $special = $special . ' ' . strtoupper($this->config->get('config_currency'));
        } else {
            $special = '""';
        }

        return $special;
    }

    private function getSpecialPricePeriod($product_info) {
        if (!empty($product_info['special']) && $this->config->get('facebook_business_sync_specials_status') && !empty($product_info['special_date_start']) && !empty($product_info['special_date_end']) 
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2.3.x-and-above/upload/catalog/controller/extension/module/facebook_business.php [519:573]:
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        if ($product_to_facebook['google_product_category']) {
            return $product_to_facebook['google_product_category'];
        } else {
            $category = $product_info['category_name'];

            if (!$category) {
                $category = $this->config->get('config_name');
            }
    
            return $this->formatAndTrimString($category);
        }
    }

    private function getBrand($product_info) {
        if ($product_info['manufacturer_name']) {
            $brand = $product_info['manufacturer_name'];
        } else {
            $brand = $this->config->get('config_name');
        }

        return $this->formatAndTrimString($brand);
    }

    private function getPrice($product_info) {
        if ($product_info['tax_class_id']) {
            $price = $this->tax->calculate($product_info['price'], $product_info['tax_class_id'], $this->config->get('config_tax'));
        } else {
            $price = $product_info['price'];
        }

        $price = number_format(round((float)$price, 2), 2, '.', '');
        $price = $price . ' ' . strtoupper($this->config->get('config_currency'));

        return $price;
    }

    private function getSpecialPrice($product_info) {
        if (!empty($product_info['special']) && $this->config->get('facebook_business_sync_specials_status')) {
            if ($product_info['tax_class_id']) {
                $special = $this->tax->calculate($product_info['special'], $product_info['tax_class_id'], $this->config->get('config_tax'));
            } else {
                $special = $product_info['special'];
            }

            $special = number_format(round((float)$special, 2), 2, '.', '');
            $special = $special . ' ' . strtoupper($this->config->get('config_currency'));
        } else {
            $special = '""';
        }

        return $special;
    }

    private function getSpecialPricePeriod($product_info) {
        if (!empty($product_info['special']) && $this->config->get('facebook_business_sync_specials_status') && !empty($product_info['special_date_start']) && !empty($product_info['special_date_end'])
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