[kiryandil]

Since you used a Visa card once, maybe you can explain to us how the Visa information database works.

We're all ears.

                     

[semimojo]

Since you used a Visa card once, maybe you can explain to us how the Visa information database works.

This isn’t a question of how a particular database “works”. There are dozens of organizations and access methods that could get you to the same result.

The germane question is what data is in the database.

You have no idea and are afraid to speculate because it will reveal your ignorance.