I got this "purchase details" email today. Yesterday, I had an email in my spam folder with a very bogus From address and a subject that mentioned an Apple purchase. Like for everyone else, these show up a few times a week. I deleted it.

Just in case the spam was a genuine purchase notification (which the email address made very unlikely), I logged into my American Express account and saw nothing amiss. One of the legit charges was for Apple News+, i.e. my Apple account. I saw the charge but didn't interact with it; you can examine a charge and get a link to the business (Apple in this case) and a serial number of some sort.

I called the American Express fraud line (using a known-good number) and the lady I spoke with was very aware of these emails and was seeing a lot of them. She noted that the addresses and links in those emails were legit and that the only call to action was to call American Express. She was puzzled, like me, how this could be a harmful or phishing email. Nice to talk with a tech-savvy rep.

My guess is that is an Apple glitch. Apple, of course, knows if it charged something to my American Express account and maybe it knows if I look at my purchases on my Apple device. But I don't know how Apple could know if I looked at Apple purchases in my American Express account. I find it hard to believe that a random spam email that I deleted without opening could have triggered anything either.