Hello,
Currently we don’t have the option to add a barcode directly from within the plugin.
You/your developer can fully customize the gift card email to suit your needs. We use the built in WooCommerce email template system. To override the email follow these steps:
1. Log into your WordPress admin area.
2. Click on WooCommerce -> Settings -> Emails -> PW Gift Card Email
3. Under the “HTML Template” section, click “Copy file to theme”
4. Once the file is in your theme folder, open it up in a text editor and make any changes. You can change colors, wording, etc.
If you have trouble with Step 3, you can manually copy this file:
/wp-content/plugins/pw-woocommerce-gift-cards/templates/woocommerce/emails/customer-pw-gift-card.php
To here (you may need to create the subfolders if they do not exist in your theme folder):
/wp-content/themes/<your-active-theme>/woocommerce/emails/customer-pw-gift-card.php
You can find out more about customization here: https://docs.woocommerce.com/document/configuring-woocommerce-settings/#section-21
Hope that helps, let me know if you have any questions!