Once a user has purchased a gift voucher, it's important to actually provide the voucher code for them to pass on to the required party. For example, on our order summary template (shop/customer/order.html for example), we have the following code looping through line items for the order.
{% if craft.giftVoucher.isVoucher(item) %}
{% for code in item.purchasable.getCodes(item) %}
Code: {{ code }}<br />
{% endfor %}
{% endif %}
Because multiple vouchers can be purchased for one line item, it's important to loop through potentially multiple unique voucher codes as above.
If you're looking for something a little prettier than simply showing the code in your order confirmation page or email, you may want to look at generating a PDF Template.
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