Help needed for In-App Purchase Screenshot for Apple Review?

Xenix Games

I have included in-app puchases in my new game that is to be published to Apple. When creating the in-app purchases in itunes connect it says...
"Before you submit your In-App Purchase for review, you must upload a screenshot. This screenshot will be for review purposes only. It will not be displayed on the App Store. Screenshots must be at least 312x390 pixels and at least 72 DPI."

My question is how can I take this screenshot of the in-app purchase working? Is it possible to take this screenshot in GameSalad or do I need to take it on an Apple device? How have you managed to get around this?

Thanks for any help

bjandthekatz

I usually just take a screenshot of the scene with the inapp purchase in it.

Xenix Games

Thanks @bjandthekatz