I have a recent WordPress installed in the root folder as well as a membership script (aMember) installed in a separate directory.
Everything works fine... the payment goes through, you can log into aMember to see your membership info etc. So when you click your membership link it should go to the protected folder in WordPress and grant access to the person logging in. But the problem is that it will not allow access.
The go-between plugin has been installed and configured in WordPress. Here is the info on the plugin...
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This should be a fairly quick fix. I will pay immediately after fix. I have excellent feedback record as you can see.