What is the catch with cash back credit card?

Related questions

1. How does MasterCard make money?
2. Does Mcdonalds do cash back?
3. Is it bad to have a lot of credit cards?
4. Why do credit cards offer cash back?
5. Do you get charged for cashback on a credit card?
6. What is the point of cashback?
7. Is it bad to have too many credit cards?
8. What is the best cash back credit card?
9. Is Mastercard Black card worth it?
10. Why do banks offer cash back?

Tags

1. #earns
2. #purchase
3. #percentage
4. #credit
5. #purchases
6. #afford
7. #rebate
8. #essentially
9. #merchants
10. #every
11. #interchange
12. #cards
13. #issuers
14. #transaction
15. #because