How do store atm machines etc work?

[winblowz]

When you pay for something using your credit card, the machine that you use to pay has to send a message to your bank account telling it to deduct a certain amount of money.

How is this secure?
what port does it use?

thanks.. I'm having some trouble putting this together. I don't see how this works exactly...

 

[jrdwstfll]

http://money.howstuffworks.com/atm.htm

enjoy

 

[Pavlyk]

When you pay for something using your credit card, the machine that you use to pay has to send a message to your bank account telling it to deduct a certain amount of money.

How is this secure?
what port does it use?

thanks.. I'm having some trouble putting this together. I don't see how this works exactly...

Wait a tick, are you planning to use this as an evil plan to over take the ATM? Well, if you are ! Then.......I wish you luck

 

[Regulus]

Me too. And be sure to share!!! =D

 

[Harper]

Me too. And be sure to share!!! =D

DITTO

 

[ShoobieRat]

Why not just do like the rest of us and wait for people to make a transaction, then club them and run off with the money?

Or...you could always get a job...

 

[Regulus]

I like the 1st idea better lol.