When you publish through Bookvault, we will add a barcode to the bottom right of the back cover. You do also have the option to download one and place it yourself anywhere on the back.
To do so, head to 'Publishing Projects', if you're ISBN has been assigned, you'll see the option to 'Download Now'
This will then bring a section up like the below, you can input the retail cost in GBP, EUR and USD.
Once you've input all the information, simply click the 'Download Now' button and it will save your barcode ready for you to add to your cover.