Вывод поля в письме

<?php
/**
 * The Template for invoice details
 *
 * Override this template by copying it to [your theme]/woocommerce/invoice/ywpi-invoice-details.php
 *
 * @author        Yithemes
 * @package       yith-woocommerce-pdf-invoice-premium/Templates
 * @version       1.0.0
 */

/** @var WC_Order $current_order */
/** @var YITH_Document $document */

//$current_order = YITH_YWPI_Order::get_order ( $document->order );
$current_order   = $document->order;
$invoice_details = new YITH_Invoice_Details( $document );

?>

	<table class="invoice-details">
		<thead>
		<tr>
			<?php if ( ywpi_is_enabled_column_picture ( $document ) ) : ?>
				<th class="column-picture"></th>
			<?php endif; ?>

			<th class="column-product"><?php _e ( 'Product' , 'yith-woocommerce-pdf-invoice' ); ?></th>

			
		</tr>
		</thead>
		<tbody>
		<?php

		/** @var WC_Product $_product */
		foreach ( $invoice_details->get_order_items () as $item_id => $item ) {
			?>
			<tr>
				<!-- Show picture if related option is enabled -->
				<?php if ( ywpi_is_enabled_column_picture ( $document ) ): ?>
					<td class="column-picture">
						<img src="<?php echo $invoice_details->get_product_image ( $item ); ?>"/>
					</td>
				<?php endif; ?>

				<td class="column-product">
					<!-- Show product title -->
					<?php echo $item[ 'name' ]; ?>
					<br>

					<?php if ( ywpi_is_enabled_column_variation ( $document ) ) : ?>
						<?php echo $invoice_details->get_variation_text ( $item_id ); ?>
					<?php endif; ?>

					<?php if ( ywpi_is_enabled_column_sku ( $document ) ) : ?>
						<?php echo $invoice_details->get_sku_text ( $item ); ?>
					<?php endif; ?>

					<?php if ( ywpi_is_enabled_column_short_description ( $document ) && ( !empty( $_product->post->post_excerpt ) ) ) :
						echo '<span class="product-short-description">' . $_product->post->post_excerpt . '</span>';
					endif; ?>
				</td>
				<?php if ( ywpi_is_enabled_column_quantity ( $document ) ) : ?>
					<td class="column-quantity">
						<?php echo ( isset( $item[ 'qty' ] ) ) ? esc_html ( $item[ 'qty' ] ) : ''; ?>
					</td>
				<?php endif; ?>

				
			</tr>

			<?php
		} // foreach;

		if ( ywpi_is_visible_fee_details_section ( $document ) ) :

			foreach ( $invoice_details->get_order_fees () as $item_id => $item ) {
				?>

				<tr class="border-top">
					<?php if ( ywpi_is_enabled_column_picture ( $document ) ) : ?>
						<td class="column-picture">
						</td>
					<?php endif; ?>

					<td class="column-product">
						<?php echo !empty( $item[ 'name' ] ) ? esc_html ( $item[ 'name' ] ) : __ ( 'Fee' , 'yith-woocommerce-pdf-invoice' ); ?>
					</td>

					<?php if ( ywpi_is_enabled_column_quantity ( $document ) ) : ?>
						<td class="column-quantity">
						</td>
					<?php endif; ?>

					

				</tr>

				<?php
			}   // foreach
		endif;

		if ( ywpi_is_visible_shipping_details_section ( $document ) ) :

			foreach ( $invoice_details->get_order_shipping () as $item_id => $item ) {
				?>

				<tr>
					<?php if ( ywpi_is_enabled_column_picture ( $document ) ) : ?>
						<td class="column-picture">
						</td>
					<?php endif; ?>

					<td class="column-product">
						<?php echo !empty( $item[ 'name' ] ) ? esc_html ( $item[ 'name' ] ) : __ ( 'Shipping' , 'yith-woocommerce-pdf-invoice' ); ?>
					</td>

					<?php if ( ywpi_is_enabled_column_quantity ( $document ) ) : ?>
						<td class="column-quantity">
						</td>
					<?php endif; ?>

					

					
				</tr>
				<?php
			};
		endif;
		add_filter( 'woocommerce_enable_order_notes_field', '__return_true' );
		?>
		</tbody>
	</table>
    

это код письма отправки инвойса в формате PDF
плагин — yith woocommerce pdf invoice

и вы не тот плагин смотрите
вот, который я использую

не то, это один и тот же текст во всех инвойсах выводится
в настройках нету вывода доп информации, надо как-то через код добавлять