lib/AdobeMarketingCloud/Api/Permissions.php
public function authenticate($username, $password)
    {
        $response = $this->post('Permissions.Authenticate', array(
            'login'    => $username,
            'password' => $password,
        ));

		return $this->returnResponse($response);
    }
public function authenticate($username, $password)
    {
        $response = $this->post('Permissions.Authenticate', array(
            'login'    => $username,
            'password' => $password,
        ));

		return $this->returnResponse($response);
    }
Internal method to authenticate a set of credentials
Credentials can be found in the SiteCatalyst Admin Console
Admin > Admin Console > Company > Web Services

@param   array $username  - the web services username
@param   array $password  - the web services shared secret
@return  boolean - whether or not the authentication was successful