Just like any other product, a gift card can be added to an offer that can be sent to a customer. However, the gift card will only be issued once the offer has been converted into an invoice and marked as "Paid" in the admin area.
The voucher can also be added to drafts. A new line is then created in the invoice for the voucher.
When a customer has been added to the invoice, as soon as the voucher is issued, an email with the gift card is automatically sent to their email address.