We are using Magento 1.4.1 on [url removed, login to view] to handle all sales. We sell subscription based services and use google checkout as payment gateway.
Currently we have not implemented subscriptions as recurring payments and also we have problems with tax payments for certain types of companies. All payments are normal one time payments.
We need to get recurring payments using google checkout properly integrated into magento and we need to get the tax problems solved.
We also work with subversion, so knowledge of svn and changesets are a must