peter,
unfortunately, i can not provide any additional support for the sandbox set up. it is there for developers to work with.

it seems that you had square working and that your problem was with super orders. so now you want to move on to enabling a sandbox account on your live site so that you can get it working with super orders? noting that super orders is a product that has not been updated for quite some time.

there is a lot going on; and unfortunately i do not have the time to resolve your sandbox set up.

maybe someone else can help you out; but it goes beyond what i am able to provide in this free forum.

best.