"Print Invoice" Button in My Account Orders

add_filter( 'woocommerce_my_account_my_orders_actions', function ( $actions, $order ) {
    if ( $order->has_status( array( 'processing', 'completed' ) ) ) {
        $actions['wpide-invoice'] = array(
            'url'  => wp_nonce_url( add_query_arg( 'wpide_invoice', $order->get_id(), wc_get_page_permalink( 'myaccount' ) ), 'wpide_invoice_' . $order->get_id() ),
            'name' => 'Invoice',
        );
    }

    return $actions;
}, 10, 2 );

add_action( 'template_redirect', function () {
    if ( empty( $_GET['wpide_invoice'] ) ) {
        return;
    }

    $order_id = absint( $_GET['wpide_invoice'] );
    $nonce    = isset( $_GET['_wpnonce'] ) ? sanitize_key( wp_unslash( $_GET['_wpnonce'] ) ) : '';

    if ( ! wp_verify_nonce( $nonce, 'wpide_invoice_' . $order_id ) || ! current_user_can( 'view_order', $order_id ) ) {
        wp_die( esc_html( 'Sorry, you cannot view this invoice.' ), 403 );
    }

    $order = wc_get_order( $order_id );

    if ( ! $order || ! $order->has_status( array( 'processing', 'completed' ) ) ) {
        wp_die( esc_html( 'Invoice not available.' ), 404 );
    }

    nocache_headers();
    $invoice = $order->get_meta( '_wpide_invoice_number' );
    ?>
    <!doctype html>
    <html lang="<?php echo esc_attr( get_bloginfo( 'language' ) ); ?>">
    <head>
        <meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><meta name="robots" content="noindex">
        <title><?php echo esc_html( 'Invoice #' . $order->get_order_number() ); ?></title>
        <style>body{font:14px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;color:#111;max-width:760px;margin:2em auto;padding:0 1em}table{width:100%;border-collapse:collapse;margin:1.5em 0}th,td{text-align:left;padding:.5em;border-bottom:1px solid #ddd}.num{text-align:right}@media print{.no-print{display:none}}</style>
    </head>
    <body>
        <p class="no-print"><button onclick="window.print()"><?php echo esc_html( 'Print or save as PDF' ); ?></button></p>
        <h1><?php echo esc_html( get_bloginfo( 'name' ) ); ?></h1>
        <p><?php echo esc_html( 'Invoice for order #' . $order->get_order_number() ); ?><?php echo $invoice ? '<br>' . esc_html( 'Invoice number: ' . $invoice ) : ''; ?><br><?php echo esc_html( wc_format_datetime( $order->get_date_created() ) ); ?></p>
        <p><?php echo wp_kses_post( $order->get_formatted_billing_address() ); ?></p>
        <table>
            <?php foreach ( $order->get_items() as $item ) : ?>
                <tr><td><?php echo esc_html( $item->get_quantity() . ' × ' . $item->get_name() ); ?></td><td class="num"><?php echo wp_kses_post( $order->get_formatted_line_subtotal( $item ) ); ?></td></tr>
            <?php endforeach; ?>
            <?php foreach ( $order->get_order_item_totals() as $row ) : ?>
                <tr><th><?php echo esc_html( wp_strip_all_tags( $row['label'] ) ); ?></th><td class="num"><?php echo wp_kses_post( $row['value'] ); ?></td></tr>
            <?php endforeach; ?>
        </table>
    </body>
    </html>
    <?php
    exit;
} );