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But I can find only redirect url in app settings page. Is redirect url and postback url are one and the same.
Can I have multiple postback URL for the same app?
You are redirected to registered redirect_url post the login flow ends.
But the Postback API sends a POST request with a JSON payload to the registered postback_url of your app when there is any change in order's status.Check the details here.
Connect Developer dashboard has form for both postback and redirect url.Check on this page post login.