If you are using WHMCS v8 or higher, the installation is completed. You do not have to enable AutoAuth and can directly continue with the editing of the e-mail templates.
If you did not defined an AutoAuth key in your WHMCS installation, then open the configuration.php
file, which can be found at the root directory of WHMCS, and add following code at the end of your file:
$autoauthkey = "secure_string"; |
Replace "secure_string" with a random string. If no key is defined, the auto login will not work. In that case an error message get logged into your Activity Log which tells you to add a Auto Auth key.
Since WHMCS v7.10 AutoAuth must be explicitly enabled in the WHMCS settings. Navigate to Setup > General Settings > Security and set the value of the option "Allow AutoAuth" to "Enabled".