What data from my iPhone gets sent to Apple and Developers when I download a "FREE" app, and when I purchase an app?

I would like to know what data is sent to a developer, and to Apple, whenver I download a FREE app from the AppStore, and also what additional data is sent once I decide to purchase the app.
I understand that I have to explicitly allow access to an for certain features (ie Motion or Contact(s) data), but does this also mean that this data is being transmitted to the developer? And when I sign up to an app's subscription service, like FourSquare, am I identified by name or just by my Apple device identifier?
And, finally, does Apple actually restrict/prevent an app from abusing information available or do they just trust the developer to adhere to policy?
Thanks for your input,
Rupe

this is hard to answer but what I know is that:
if you download a free / paid app, Apple makes sure that the app is not going to harm your device by checking the codes do not have viruses/malwares.
However, when it comes to your data, it is hard not to be controlled by Apple . That is why you have to read the privacy policy of each app BEFORE downloading into your device e.g: you download Facebook app, it can read your IP address and estimate your location even if you turn the GPS off. some apps run in the background and obtain your pictures if you allow these apps to gain access into your pictures..... etc
Apple helps you to be in control of your device and data by many methods , but it is your responsibility to keep your data safe as well , by reading about the developers of your app and what kind of info it is collecting by reading privacy policy.
Talking about this need lot of words to explain so I tried to summarise the point

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