Subscriber ID and Receipt Information matching

My company currently use receipt information to map a customer and their purchases to an internal CID. We would like to tie a subscriber id in our summary sales report to an internal CID to have full end-to-end visibility on customer state and expected payments. Is it possible to match receipt information for a customer to a subscriber id? If privacy is an issue why can't apple encrypt/obfuscate the subscriber id before reporting? Thanks for the help!