StartActivity Intent for Custom Tabs URL

StartActivity Intent for Custom Tabs URL

        val sendLinkIntent = Intent(main,MainActivity::class.java)
        sendLinkIntent.putExtra(Intent.EXTRA_SUBJECT,"This is the link you were exploring")
        val pendingIntent = PendingIntent.getActivity(main,0,sendLinkIntent,PendingIntent.FLAG_UPDATE_CURRENT)
        // Set the action button
        AppCompatResources.getDrawable(main, R.drawable.close_icon)?.let {
            DrawableCompat.setTint(it, Color.WHITE)
            builder.setActionButton(it.toBitmap(),"This is your link",pendingIntent,false)
        }
        // Create the Custom Tabs Intent and launch the URL
        val customTabsIntent: CustomTabsIntent = builder.build()
        customTabsIntent.launchUrl(main, Uri.parse(url))

With out an icon click or action can we get the url?
Lets assume that I have a url, which internally redirects I have to capture or intercept one url and then post data to another url. I have done the same in webview. I could not find the same to do in custom tab.