I just purchased the Easy In-App Purchase plugin, and am trying to set it up. On iTunes Connect, it I chose the "non-consumable" option, and started to fill out the form. However, it says I need to include a screenshot. I assume that's a screen shot of what the in-app purchase screen will look like? If so, how do I get that, since it requires the in-app purchase screen to be set up already, and the plugin requires the description on iTunes connect to already be saved. What comes first, the chicken or the egg?

No, This is just an image that will appear on the purchase screen. I just used my app logo.

I'm looking on the iTunes Connect control panel. 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 640x920 pixels and at least 72 DPI.

ok, i was thinking of the onscreen image on the purchase screen. for itunes connect i uploaded the background image of my app. maybe i miss understood what they wanted. My app in currently in extended review so i'll let you know if its rejected because of my image being wrong

I just bought the plugin yesterday and just uploaded any screen shot (will change later) in iTunes just so I could test in sandbox. So far all working great. The plugin brings in all the info (price/description) for testing and the test purchases worked great. Must create a user account in iTunes and log out of your (iTunes & App Stores) account in settings on your test device, to be able to use the test user email/password to login for testing. Hope this helps you.