Gateway/Config/Config.php
public function getCustomCss() {
        // Prepare the paths
        $base_url = $this->storeManager->getStore()->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_MEDIA);
        $file_path = $this->getValue(
            'payment/checkout_com/checkout_com_base_settings/custom_css',
            $this->storeManager->getStore()
        );

        return $base_url . 'checkout_com/' . $file_path;
    }
public function getCustomCss() {
        // Prepare the paths
        $base_url = $this->storeManager->getStore()->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_MEDIA);
        $file_path = $this->getValue(
            'payment/checkout_com/checkout_com_base_settings/custom_css',
            $this->storeManager->getStore()
        );

        return $base_url . 'checkout_com/' . $file_path;
    }
public function getCustomCss ( ) { // Prepare the paths $ base_url = $ this -> storeManager -> getStore ( ) -> getBaseUrl ( \ Magento \ Framework \ UrlInterface :: URL_TYPE_MEDIA ) ; $ file_path = $ this -> getValue ( 'payment/checkout_com/checkout_com_base_settings/custom_css' , $ this -> storeManager -> getStore ( ) ) ; return $ base_url . 'checkout_com/' . $ file_path ; }
Returns the custom CSS URL for embedded integration.

@return string
Returns the custom CSS URL for embedded integration .