Set up Apple in-app purchase for an issue

Prior to publishing an issue, you must get your in-purchase approved by Apple.

In iTunes Connect:

Click 'Manage Your Applications'
Click on your application
Click 'Manage in-app purchases'
Click 'Create New'
Choose 'Non-Consumable'
Enter a reference name for reporting e.g. 'September 2011'
Enter a product id. This must be prefixed by the app bundle id e.g. 'com.organization.publication.2011.october'
Click 'Add Language'
Choose a language
Enter a display name (for display in the app store and on the purchasing pop-ups) e.g. 'September 2011'
Enter a display description (not currently displayed)
Choose a price tier (use the pricing matrix beneath the drop-down to look up the correct tier)
Under 'Screenshot for Review' click 'Choose file' and select a screenshot. Screenshots must be 960x640, 960x600, 640x960, 640x920, 480x320, 480x300, 320x480, 320x460, 1024x768, 1024x748, 768x1024 or 768x1004 pixels. They are never displayed so it doesn't matter if you have to 'squash' your image to fit
Click 'Save'
Once happy, click 'Submit for Review', allowing at least 1 week for Apple to review and approve before publishing the issue