bookingpress_currency_support

    add_filter('bookingpress_currency_support', 'bookingpress_currency_support_func', 10, 2);
    function bookingpress_currency_support_func($notAllow, $bookingpress_currency)
    {
        //$notAllow Not supported by payment gateways
        //$bookingpress_currency Selectd Currency

        return $notAllow;
    }