Can you convert an iOS freemium app to a paid app without double-charging customers?

The scenario is:

• I created a free iOS app that had in-app purchases for premium content
• I now开发者_开发技巧 want to convert the app into a paid only version of it and remove all IAP stuff

My questions are:

1. Will the AppStore let all current customers download the app again without double-charging them? (i.e. forcing them to pay for an app that used to be free)
2. As long as I keep the bundle identifier (i.e. com.yourcompanyname.appname) the same, it will just overwrite the old app like a normal upgrade, correct?

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You're correct: if it's the same app -- same bundle id, submitted as an update -- then existing customers will be able to download it for free forever, like any upgrade.