How does Apple pay work technically?

Related questions

1. Is Apple pay better?
2. Do any gas stations take Apple pay?
3. Is Apple pay dangerous?
4. Is Apple pay Anonymous?
5. How much does it cost to use Apple Pay?
6. How do I activate Apple pay?
7. Is Apple Pay Safe?
8. Does Apple accept cash?
9. Do I get charged for using Apple Pay?
10. Is Apple pay free to use?

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