What are the requirements to use PHP eFax?
You need to have an eFax® Developer account. PHP eFax only works with that system. If you have an eFax email account, it will not work with our library–you will have to upgrade to the full eFax Developer system in that case. You need to install the HTTP Request module. This module is used to send requests to the eFax® Developer server. More information can be found in our PHP eFax documentation. A valid SSL certificate is also strongly suggested.