Braintree\Configuration::authUrl PHP Method

    public function authUrl()
    {
        switch ($this->_environment) {
            case 'production':
                $serverName = 'https://auth.venmo.com';
                break;
            case 'qa':
                $serverName = 'https://auth.qa.venmo.com';
                break;
            case 'sandbox':
                $serverName = 'https://auth.sandbox.venmo.com';
                break;
            case 'development':
            case 'integration':
            default:
                $serverName = 'http://auth.venmo.dev:9292';
                break;
        }
        return $serverName;
    }