Digital vouchers work just like regular gift cards. Each voucher will come with instructions on how it can be used.
In most cases, you can use a voucher online or in-store but this can and does vary for each deal. If you're using a voucher online then you'll typically be presented with an option to add the details at checkout. If you're using a voucher in-store then you'll need to present it in-store.
You'll be able to access all of the details through the My Vouchers section of your account, or on the email you were sent after purchase. Please check the terms available on each deal for clarification on how and where it can be used. If anything isn't clear then please get in touch and we'll do our best to help.