I have an example app over here:
https://github.com/dobesv/retweetster
It's quite old but maybe it will help you in some way.
I can't tell based on the information you gave what the problem would
be, but I'd double-check your "authentication data" and see if it
works right.
I think there are some nice tools out there to just mess with the
twitter API directly without coding, like
https://apigee.com/console/twitter where you could try putting the
same keys and see if they work.
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