Yes, Apple Pay is accepted as a payment method at White Castle.
Apple.com verifies on their “Where to Use” page that customers can pay for their meal using Apple Pay.
This press release on whitecastle.com also confirms that the company accepts Apple pay. It states ” White Castle also accepts mobile payments via Apple Pay and Android Pay. “
The original release date of Apple Pay was October 2014. While we don’t have the official launch of Apple Pay in White Castle restaurants, you can see by the below Twitter posts that it started by at least June 2015. We give the company credit for being one of the early users of this technology.