Apple Pay Human Interface Guidelines
Apple (PDF) (via John Gruber):
You can add line items to the purchase total to explain additional charges. A line item consists of a label and an associated cost, such as “Gift Wrap $5.00” or “Tax $4.53”. You can also add an item with a negative value, such as “Friday Discount -$2.00”. Use line items for charges that are added to the merchandise being purchased; don’t use them to display an itemized list of products.
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Note that the Apple Pay sheet always displays text in all capital letters.
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I'm always bemused—most recently last week—when I get an email with my email address (which, online, I always type completely lowercase) entirely or partly (the local part) uppercased. All the more so because I have in the past encountered mail servers where the case-sensitivity of the local part *was* enforced (though it's been so long that I can no longer remember when or where I ran into said server; perhaps someone believes that it and all such counterparts have been retired with more Postel’s Law-friendly replacements? :P ).
Per RFC 2821, the local part of the email address before the "@" is case-sensitive. The email address is all uppercase in the screenshot in the PDF. I guess they're relying on every one having configured his mail server to accept incoming mails regardless of case. Either that or they don't know what they're doing.