Apple should be able to demonstrate the investments they have made and get other companies (like PayPal) to pay a reasonable fee, like 10¢, for each transaction their customers enjoy. Not that complicated.
On the flip side, those other companies need to guarantee that there will be no malware from using their software, and they should make their, and Apple's, customers for any crimes there customers suffer - including reimbursement of financial losses.
On the flip side, those other companies need to guarantee that there will be no malware from using their software, and they should make their, and Apple's, customers for any crimes there customers suffer - including reimbursement of financial losses.