What does invalid transaction mean on a card machine?

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Tags

1. #holder
2. #should
3. #times
4. #often
5. #possibly
6. #quickly
7. #amount
8. #their
9. #attempted
10. #issuing
11. #invalid
12. #multiple
13. #contact
14. #transaction
15. #accept
16. #merchant
17. #returned
18. #issuer