function getInternalAuthToken($tenantKey) 
	{
		$tenantKey = $tenantKey == null ? $this->tenantKey : $tenantKey;	
		if ($this->tenantTokens[$tenantKey] == null) {
			$this->tenantTokens[$tenantKey] = array();
		}
		return isset($this->tenantTokens[$tenantKey]['internalAuthToken'])
			? $this->tenantTokens[$tenantKey]['internalAuthToken']
			: null;
	}