Example of how to include the currency code within the Attendee information ticket total row.

tw_ee_Line_Item_Display_Strategy___price_include_currency_code.php

<?php //Do not include the opening PHP tag if you already have one

add_filter('FHEE__EE_Default_Line_Item_Display_Strategy___item_row__total', 'tw_ee_Line_Item_Display_Strategy___price_include_currency_code', 10, 2);
function tw_ee_Line_Item_Display_Strategy___price_include_currency_code($price, $line_item) {
    $mny = EE_Registry::instance()->CFG->currency instanceof EE_Currency_Config
        ? EE_Registry::instance()->CFG->currency
        : new EE_Currency_Config();

	return $price . ' <span class="' . $cur_code_span_class . '">(' . $mny->code . ')</span>';
}