Manipulate item data before adding it to a InvoiceXpress document on the "Invoicing with InvoiceXpress for WooCommerce – Pro" plugin

invoicexpress_woocommerce_document_item.php

<?php

// Change item properties
add_filter( 'invoicexpress_woocommerce_document_item', function( $item_data, $item, $product, $order_object, $document_type, $args ) {
	// Do whatever you want with the $item_data array, for example, change its reference (sku)
	$item_data['name'] = 'whatever';
	// Or add something to its description (product title)
	$item_data['description'] .= 'whatever';
	// And return it
	return $item_data;
}, 10, 6 );

// Remove item from the document
add_filter( 'invoicexpress_woocommerce_document_item', function( $item_data, $item, $product, $order_object, $document_type, $args ) {
	if ( $your_condition ) {
		return false;
	}
	return $item_data;
}, 10, 6 );