I have a Facebook Messenger chatbot, which is part of a broader platform, which also includes Google Assistant Action.
In some cases, I want my users to switch from Messenger app to Google Assistant app (both on iOS and Android), so they can speak to my Action.
As far I understood, it's not possible to "push" a message (or "wake up" an Action) to a user through GA Action, so I'd like to forward a user from Messenger to Google Assistant app using some kind of deeplinking. At least - just to launch the app, at best – launch it with forwarded parameters, like "user_id" or a message to be sent to GA on user's behalf.
How do I do it?
How do I know Google Assistant app's deep link "scheme://" for iOS and Android?
You can use the web link that your Action on Google get once it's been published. For example: https://assistant.google.com/services/a/id/66888e9b751b325a/
When the user click on this link (Android or iOS) - It will open the assistant and will start the action.
As for user_id and other authentication methods - At the moment it's not possible.