Also, is it possible to combine the IAP part of SDK Box with Cocos Helper? Or will the frameworks mess with each other?

Most of the features have made it to the app store but some haven’t from our end but have most likely from other developers.

You can use SDKBOX and the Cocos Helper together.

Do I need to do anything special when I combine SDK Box and Cocos Helper? Or do I just do each of their setups and then it’ll be fine?

Nope you should be all good if you follow the appropriate steps

You can use this new Cocos Helper website http://www.sonarsystems.co.uk/cocoshelper.php