What is 'detail reference' when personalising my gift?

If you have activated 'Detailed invoice' in your 'Settings' you will see this field appear when personalising your gift.

When viewing an invoice you will always see the orders and which gifts, but no further details.

If you want to view the details of each of the gifts, you can add a 'detail reference' to each of the gifts when placing an order. When you view the invoice for this order, there will be a link here for each 'detail reference'. When you click on this link, you will see all the details of the gifts.