App is in pending state

I created the publisher app but still it is in pending state. Also there is confusion as below:
When I go to and click (assuming it will take me to latest API) it takes me to and shows below message:
"The current set of APIs are being phased out. Please make sure you migrate to Kite Connect 3.0 APIs at the earliest. Read more."
UPon clicking read more, it takes me to where there is no information found about Kite Publisher.

What I am trying to do:
I am creating a .NET WPF application that will allow user to click the button. This button takes user to Zerodha and opens the trading page with filled values with the order. I do not see any documentation or sample about publisher app. Even if it is there, it seems to be old. So I am in deadlock stage where I don't know how to proceed.

Please help urgently.

This discussion has been closed.