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A comment on Teller – API for your bank account. Parent comment

Re:Teller – API for your bank account by Spivak on Wednesday June 21, 2017 @02:48PM (#14606792)
The bank has to deploy their client code to all of their users before they can depreciate the old API. That should give them plenty of buffer time to reverse engineer the changes.
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Re:Teller – API for your bank account by Alupis on Wednesday June 21, 2017 @02:58PM (#14606879)
That doesn't make sense.

"All" of their client code is a bunch of apps, that mostly auto-update. My bank (small town credit union) has a banking app that refuses to work at all unless it's the most recent version of the App. I see no reason why this would be a challenge for the bank - it's only a challenge for this service.

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Re:Teller – API for your bank account by zo1 on Wednesday June 21, 2017 @03:33PM (#14607113)
That doesn't stop them from deploying new APIs to their client software deactivated. Then "flip" a switch to cause it to behave differently all at once.
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