Close. They already get a % whenever you use Apple Pay. In fact, it's part of why the EU demanded Apple provide NFC APIs to allow third-party replacements of the built-in Wallet app.
>Q: What fees does Apple charge merchants for using Apple Pay?
>Apple does not charge merchants any fees for accepting Apple Pay payments. However, merchants may still be subject to fees from their payment processor or bank. Remember, credit cards and debit cards are behind each Apple customer purchase.
>Apple Pay fees are generally lower than traditional credit card processing. Credit card issuers charge small businesses substantially more. As such, many SMBs ask employees to encourage Apple Pay transactions.
>Merchants, on the other hand, aren’t charged at all to use Apple Pay on physical and eCommerce transactions.
Looks like Apple Pay is cheaper for everyone except banks:
>Major banks such as Bank of America, JP Morgan Chase, and Capital One are unhappy with their cut from Apple. So much so that they’ve formally requested that Visa, “change the way that it processes certain Apple Pay transactions.” In other words, pay Apple less in transaction fees.
This website has a better breakdown of costs under the "What are the fees" section, but no firm figures, and the only estimate is from 10 years ago:
