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Hello we have a website where our customers are given a promotional code to download an MP3. This works fine for everything apart from an iPhone where you can't directly download music.
We are looking for a way to download the music onto an iPhone without the need for an additional Plugin - if itunes needs to be used that is fine - but the download needs to be limited to only be downloaded with the use of a promotional code - and this promotional code can only be used once (i.e. it can't be forwarded onto friends to download).