How do e vouchers work?

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Tags

1. #online
2. #values
3. #number
4. #through
5. #channels
6. #electronically
7. #voucher
8. #generated
9. #issues
10. #websites
11. #merchant
12. #printed
13. #these
14. #redeemed
15. #stored
16. #interfaces
17. #vouchers
18. #terminals