Does Apple store the card details?
No, your card details are not stored on the device or in the Cloud. When a card is added to Apple Pay, a Device Account Number replaces the need for the card number.
Apple, the Apple logo, Apple Pay, Apple Watch, Face ID, iPad, iPhone, iTunes, Mac, Safari, and Touch ID are trademarks of Apple Inc., registered in the U.S. and other countries. iPad Pro is a trademark of Apple Inc.