How do g2a keys work?

Related questions

1. Can I get a refund on g2a?
2. What is g2a Plus subscription?
3. Can you pay with paysafe on g2a?
4. What is g2a transaction?
5. How do I unsubscribe from g2a?
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7. What are game keys?
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Tags

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2. #buyers
3. #activation
4. #together
5. #profit
6. #street
7. #gumtree
8. #makes
9. #codes
10. #credit
11. #brings
12. #gamers
13. #price
14. #usual
15. #market
16. #saving
17. #games
18. #website
19. #sellers
20. #while
21. #software