In iOS 15.4, we use PKShippingMethods. We need to add SPI declarations for iOS instead of just MacOS.
<rdar://problem/91320467>
Pull request: https://github.com/WebKit/WebKit/pull/247
Committed r292470 (249321@main): <https://commits.webkit.org/249321@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment .