The fantastic of us at Alby helped resolve this ->

First, add question intent to manifest:

<queries>
    <intent>
        <motion android:title="android.intent.motion.VIEW" />
        <knowledge android:scheme="lightning" />
    </intent>
</queries>

Second, question getalby.com for encoded lnurl:

val requestUrl = "https://getalby.com/lnurlp/bitanon/callback?quantity=1000000&remark=good day" // quantity is in millisats
val consumer = OkHttpClient() 
val request = Request.Builder().url(requestUrl).construct() 
val response = consumer.newCall(request).await()

Third, parse json response for ‘pr’ which comprises encoded lnurl.

Fourth, ship Lightning PayRequest Android Intent, which can open with machine lightning pockets of your alternative:

val intent = Intent(Intent.ACTION_VIEW).apply {
    knowledge = Uri.parse("lightning:$lnurl")
}
if (intent.resolveActivity(packageManager) != null) {
    startActivity(intent)
}

Fifth, parse and deal with extra response information, similar to transaction verification url and so on.