This is a really basic app that demonstrates the bare minimum you need to do to perform in-app purchases in iOS.
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Change the bundle identifier to your own that you've created in the iOS Development Center.
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In InAppPurchasesManager.m, find this line:
SKProductsRequest *req = [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithObjects:]];
Add your product identifiers (that you set up in iTunes Connect) to the NSSet.