NFC has nothing to do with in-app purchases. That's why the new iPads will work for in app.
But yes, Touch ID and secure element are needed for in app purchase. And an app is needed to run the process of requesting the fingerprint and then filling in the secure info. Regular webpages will still be able to use your cc info if you store it in Safari keychain, but that's not ApplePay.
But yes, Touch ID and secure element are needed for in app purchase. And an app is needed to run the process of requesting the fingerprint and then filling in the secure info. Regular webpages will still be able to use your cc info if you store it in Safari keychain, but that's not ApplePay.