mrxsailor1
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Even if DDA is cashable, how do you go about writing it to chip?
godsname1, and rest of posters ...
If I can add some thing to this discussion and I hope I do not step on some ones toe ...
DDA and SDA are nothing but authorizataion mode and they do not matter unless we are talking about pos transactions.
Banks treat cash widrawl and pos transactions as two different entities ( for proof check ur bank card statement). Now this DDA and SDA only matter when you are trying to do pos treansactions.
All atms all over the world are online but thier auth is not like pos auth. They are online but not performing any DDA functions. Auth transactions are never carried out locally but with in atm networks which differ a lot from ur standard pos merchant.
Now , just to go into a bit of detil of sda and dda and for those who may be interested sda is what ppl simply call offline auth .. but basically it is just the facility on card to auth itself offline for certain amount.
Giving an example u walk into walmart and purchase 20 $ food. Now walmart being such a super store as it is ..and have so many transactions taking place for these silly amounts , has authorized an offline floor limit with its merchant. Normally it is 50 $ offline. So now all those card who have sda facility (which 90 % debit cards have) available will be authorized locally until transaction is less than 50 $.
proof : take a card which has less than 10 $ in it but was never declined in walmart and go do shopping of 40 $ . It will approve how ever after midnight when u will wake up next day ur card will have un auth over draft and if u try to use that card again in walmart without putting any money it will get decline.
also to combat fraud these stores have set total floor limit and number of transactions offline before card is taken for online auth. Normally in uk it is 2 transaction in tesco or max shping of 50 gbp.
Now dda forces the card to auth online every time. All your local pos petrol stations and casinos , money changers , elect stores etc have been forced by merchant to auth of every card online or go for dda.
There are some cards that have to be authorised every time for dda like mostly cash cards or credit cards.
Has cashing out got any thing to do with SDA Or DDA ??
Absolutely No .
If any one can claim they have found an atm that is authorizing SDA or is doing local offline auth . That will be like finding a window in bank safe.
And then coming again to main point sda / dda auths have nothing to do with atm networks.
@godsname1 its quite fancy of you to use these words in your cashing out advert but i can tell you with experience and knowledge both SDA and DDA has got nothing to do with your atm cashing out. I will recommend you should do some study on this and speciallly ISO/IEC 7816 protocol.
How ever your confusion about dda and sda auth does not imply in any way that u may be not a legit and reliable cashier !
I hope this helps .
DDA card cannot be cloned
n
Also if a hacker has hacked a POS network with DDA cards with pin, we're going to have a massive problem cashing them