loop-items-for-invoice.php

<?php 
//PayPal wants an array of InvoiceItem() objects
$items = array()
$cnt = 0;
foreach( $order['items'] as $item ) {
	$items[ $cnt ] = new InvoiceItem();
	$items[ $cnt ]
		->setName( $item['outfit'] . '-' . $item['size'] )
		->setQuantity( 1 )
		->setUnitPrice( new Currency() );
	$items[ $cnt ]->getUnitPrice()
	         ->setCurrency( "USD" )
	         ->setValue( $anitem['total'] );

	if( $anorder['res'] == 'yes' ) {
		$tax = new \PayPal\Api\Tax();
		$tax->setPercent( 4 )->setName( "Local Tax" );
		$items[ $cnt ]->setTax( $tax );
	}
	$cnt++;
}
$invoice->setItems( $items );