Minecraft and "pack" purchase.

I am trying to purchase a "pack" in Minecraft, but it states the "app was not purchases by this apple id..." I am certain this is the correct apple id as each child has their own apple id. How do I see what apple id was used to purchase Minecraft? (This is her 2nd iPad, I could not "back up" the old iPad and then "restore" it to the new iPad because the iPad would not connect to the (apple) laptop, so I logged into the same apple id on the new iPad and just downloaded the apps again, and then used her log in info to get back into the apps.)