From looking around the forums and so forth I take it that there used to be an integration module for phpFox but that it is no longer current. I am a php developer so I was wondering if I bought amember, how difficult would it be to write my own integration? Would I use the amember api to do this and/or the amember rest api?
phpFox plugin which we have, was tested with phpFox 3.0.1 and I believe it should work with current version. If there will be any issues with it, we will fix it for sure. In regards to plugins development, please have a look: http://www.amember.com/docs/API/Protect