Missing method to implement user authentication flow

[ghost]

The authentication flow is described in the official documentation, here.

It is not the same thing as the channel subscription authorization which is described here or here.

It appears that the authenticate method, required for the channel subscription authorization flow is implemented in Node, PHP and Ruby whereas the authenticate_user method, required for the authentication flow is only implemented in Node and PHP SDKs.

[ghost]

I'm working on a pull request to implement it.

[stale]

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