Is PCI compliance mandatory?

Related questions

1. How much does PCI Compliance cost?
2. What happens if not PCI compliant?
3. What does it mean to be PCI compliant?
4. Do credit unions need to be PCI compliant?
5. When was PCI compliance required?
6. What if you are not PCI compliant?
7. Who must be PCI compliant?
8. What is Level 1 PCI compliance?
9. What is the fine for not being PCI compliant?
10. What are PCI compliance requirements?

Tags

1. #currently
2. #entities
3. #validation
4. #process
5. #validated
6. #merchants
7. #according
8. #mastercard
9. #require
10. #providers
11. #mandatory
12. #compliance
13. #although
14. #store
15. #transmit
16. #cardholder
17. #service
18. #formal
19. #implemented