add custom field to print area

Try with this:

https://docs.wpovernight.com/woocommerce-pdf-invoices-packing-slips/displaying-a-custom-field/

Hi @ma7aba-star,

First of all, apologies for the delay in getting back to you on this.

We do have a filter using which you can add a custom field to the Invoice using the meta key of that field. Here’s an example code snippet that will help you do this:

function example_custom_order_fields( $fields, $order ) {
    $new_fields = array();
        
    if( get_post_meta( $order->id, 'your_meta_field_name', true ) ) {
        $new_fields['your_meta_field_name'] = array( 
            'label' => 'VAT',
            'value' => get_post_meta( $order->id, 'your_meta_field_name', true )
        );
    }
    
 
    return array_merge( $fields, $new_fields );
}
add_filter( 'wcdn_order_info_fields', 'example_custom_order_fields', 10, 2 );