How do I find the redirect_uri?

Ionic Framework ionic-v3
1

I have an Ionic2 app that I would like to add GooglePlus Authentication to.

I get the following error:

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As far as I understand, it’s because I have not set up a redirect_uri.

Question

What redirect_uri (Authorized redirect URIs) should I use for an Ionic2 app? Where do I find it?

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The following works with Facebook login.

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2

Did you find out where to discover the ionic redirect_uri?