The mFax Print to Fax driver is a simple Windows application that allows you to initiate a fax from any application that allows you to Print.
To get started, first you must download and install the driver.
At the end of the installation process you will be prompted to enter an Authorization Key. This key can be retrieved from the mFax web portal in Settings: API (see below)
Under PRINT DRIVER KEYS, type a name for the device you've installed the driver on (you can have multiple devices/keys) and click Generate. This will create a new key. Then clicking Copy will copy the key to your clipboard. Paste the key into the field in the app setup screen and click Authenticate. This will complete setup of your Print to Fax driver.