What are some common challenges faced by PHP beginners when attempting to customize WooCommerce invoices with plugins?

Common challenges faced by PHP beginners when attempting to customize WooCommerce invoices with plugins include understanding the structure of WooCommerce templates, knowing how to properly enqueue custom styles and scripts, and implementing PHP functions to modify invoice content.

// Enqueue custom styles and scripts for WooCommerce invoices
function custom_wc_invoice_styles() {
    wp_enqueue_style( 'custom-invoice-styles', get_template_directory_uri() . '/css/custom-invoice-styles.css' );
}
add_action( 'admin_enqueue_scripts', 'custom_wc_invoice_styles' );

// Modify invoice content
function custom_wc_invoice_content( $content ) {
    $content .= '<p>This is a custom message added to the invoice.</p>';
    return $content;
}
add_filter( 'woocommerce_order_invoice_item_html', 'custom_wc_invoice_content' );