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Apple may not retain the data, but the underlying card issuer does.

I trust Apple more than Visa or HSBC to keep my data from prying eyes.

If someone could make apple pay be backed by a local bitcoin wallet, then I could feel far more secure nobody is going through my payment history.

Card issuer always has to get some info if you want to be able to be reverse transactions and issue chargebacks.

There is nothing in a blockchain that can resolve this issue.

Wouldn't this mean everybody could then go through your public payment history?

Presumably such an implementation would use different wallet addresses for every payment so they couldn't be linked together.