Deleting a gift card/voucher template is never advised since it cannot be brought back. This will not affect gift cards/vouchers that have already been sold, but once deleted, you will not be able to restore it back.
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However, should you never want a particular gift card/voucher template you have the ability to completely delete it.

Navigate to 'Settings->General Settings' in the SalonBridge console:

Click on 'Gift Card Settings':

Click on the gift card/voucher template that you wish to delete and click on the 'Delete' button: