How to get push notification from website subscribing topic?

[ShahriatHossain]

Hi, thanks a lot for such a great package. It is really a very helpful one. I want to use this package to send fcm cloud message from my website to android and ios device and also to website.

I have found addRecipient message method to send message to topic and addTopicSubscription client method to subscribe the topic but this method also asking recipients_tokens. But I don't want to pass any recipients token just want to subscribe the topic so that devices and web site can get notification, is it possible? and if recipient tokens required how can I manage for website and devices?