Can I use Oyster app instead of card?

Related questions

1. Does London Pass include Oyster card?
2. Is Oyster card refundable?
3. What is an Oyster card and how does it work?
4. Do oysters have poop in them?
5. Do oysters have pearls?
6. Is contactless cheaper than oyster?
7. Can I buy an Oyster card in a shop?
8. Can I use my Oyster app to pay?
9. What does an oyster represent?
10. Is contactless same as oyster?

Tags

1. #shown
2. #cards
3. #photocards
4. #reverse
5. #other
6. #symbol
7. #contactless
8. #below
9. #shows
10. #smartcards
11. #image
12. #online
13. #account
14. #bottom
15. #oyster