This quick guide shows you how to add custom content under the subtotal shown in the minicart
/**
* Snippet Name: WooCommerce custom content under minicart subtotal
* Snipept Author: ecommercehints.com
*/
function ecommercehints_minicart_content_under_subtotal() {
echo '
Price Matched!';
};
add_action( 'woocommerce_widget_shopping_cart_total', 'ecommercehints_minicart_content_under_subtotal', 10 );