ElixirAuthGoogle.generate_oauth_url

You're seeing just the function generate_oauth_url, go back to ElixirAuthGoogle module for more information.
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generate_oauth_url(conn)

Specs

generate_oauth_url(Map) :: String.t()

generate_oauth_url/1 creates the Google OAuth2 URL with client_id, scope and redirect_uri which is the URL Google will redirect to when auth is successful. This is the URL you need to use for your "Login with Google" button. See step 5 of the instructions.

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generate_oauth_url(conn, state)

Same as generate_oauth_url/1 with state query parameter