This will hopefully be the last released before releasing this extension to TER, but feed back is needed first.
To check out a working copy of the latest release use
svn co https://svn.typo3.org/TYPO3v4/Extensions/idefa_commerce_paymentlib/trunk/ idefa_commerce_paymentlib
If you found an error and want to supply a patch use ( in the correct directory ofcourse )
svn diff > patch.diff
I've no clue how this works on windows, sorry.
Manual for this release is available as a wiki page