Hello,
If you want to "cross check" the changes you make via the API, the
most straightforward way would be to visit the AdWords web interface
at
http://adwords.google.com/ and take a look at your account's data
there.
This obviously shouldn't be necessary for normal course of
operations, as changes made via the API *should* be properly
propagated out and would always be reflected in your AdWords account,
but if you feel the need to double-check that's one way of doing it.
Cheers,
-Jeff Posnick, AdWords API Team