wpbackey plugin is one of pinkmart bundled plugins that has packed in Pinkmart package and you don’t need to activate it your self with the purchase key.
I buy your theme by seeing that you are going to give 3 premium plugins, if you are not giving the keys what is the point of buying this theme and why did you mention that you are giving them in your product details. If you are not able to provide those 3 plugin purchase keys i hove no use to buy your theme.
Please note that we always release updates for the bundled plugins and will add them to the Pinkmart package, also there are not the other features for WP Bakery Pro version that you can not be able to use them with the version we provided in our package, so please don’t have a concern about it.
.
