How do you pay for the metro in Amsterdam?

Related questions

1. Is there metro in Amsterdam?
2. Is public transport cheap in Amsterdam?
3. Is Uber legal in Amsterdam?
4. Is it easy to get around Amsterdam?
5. Is it safe to go to Amsterdam alone?
6. How much is a tram in Amsterdam?
7. Is tap water free in Amsterdam?
8. How do I buy Metro tickets in Amsterdam?
9. How much does it cost from Amsterdam airport to city Centre?
10. Does the metro go to Amsterdam Airport?

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13. #chipkaart
14. #station
15. #machines
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17. #trams
18. #ticket
19. #amsterdam