How to Change “Place Order” text in WooCommerce Checkout

// =============================================================
// CHANGE PLACE ORDER TEXT
// =============================================================
add_filter('woocommerce_order_button_html', 'change_place_order_button');

function change_place_order_button($button_html){
    $button_html = str_replace('Place order', 'Order Now', $button_html);
    return $button_html;
}