On http://code.google.com/p/getpaid/wiki/InstallingGetPaid it is told to use Products.PloneGetPaid = 0.10.1 to install Plone 4 but in Products.PloneGetPaid/Products/PloneGetPaid/catalog.py", line 4 from Products.CMFPlone import CatalogTool there is a dependency not consigned in setup.py and not compatible with Plone 4.

"not compatible with Plone 4" is totally wrong !