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function display_order_amount() { // Retrieve order_amount from query parameter $order_amount = isset($_GET['order_amount']) ? sanitize_text_field($_GET['order_amount']) : ''; // Return the HTML to display the amount if ($order_amount) { return '
Thank you for your order. The total amount is: ' . esc_html($order_amount) . '
'; } else { return 'Thank you for your order.
'; } } add_shortcode('order_amount', 'display_order_amount');