how to connect a flask chat application with dialogflow version 2 API - python-3.x

I want to connect my chat application with dialogflow version 2 which is already running on version 2 using client access token. But now i want to connect it with the new authorization system that the version 2 provides which includes google cloud account and google SDK system.
i have already done with the documentation that is provided by dialogflow https://dialogflow.com/docs/reference/v2-auth-setup
now please help me by sharing some code snippet that can connect my application with dialogflow V2 which is running on flask socket-io framework.

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Directline speech node js connection

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or sharing any documentations that can help me in implementing this will also be very helpful.
Requirements:
We need to get the workspace and the bot installed into the workspace.
Get the bot connected into the Direct Line speech channel
Get the app services running and enable public access
Get the web app and connect it to the application services.
Build the static web app (HTML page) deploy it into the GitHub repository or any kind of repository. For this thread. Considered GitHub.
Launch the application in the browser.
Get the token from the created bot and use them to connect with bot created.
Output:
The following is the output achieved in the browser.

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I need to call API's created using google cloud endpoint framework from my node.js applications. How I will be able to complete auth process and call the above APIs? Is it possible from node.js application to access the API's?
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=========================================================================
EDIT:
The answer to your initial question (“Is it possible from node.js application to access the API's”) is yes.
Your client application does not need to be in Python or Java, it can be on any language such as Node.js.
Regarding authentication, for the backend app (GAE), the flow would be the following:
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In the API Decorator, add the SA as audience also.
Finally, on your Node.js application (client side), request Authentication by requesting the JWT token:
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2.Send the signed JWT in a request to the API.
Below you have some examples of the call request. I didn’t find examples in Node.js, they are in Python, but you can translate them to Node.js since the flow is basically the same:
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I am trying something like that:
https://directline.botframework.com/api/conversations/abc123/how%20are%20you/BotConnector/NsNT2RG8oNA.cwA.Emk.8yB_FdFCy18b4iTcxBscDRxQVAB
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