I'm looking for a way to include extra description (comment) info in a lightning payment request i.e. LUD-12.

Either with anchor link:

<a href="lightning:bitanon@getalby.com" comment="payer@email.com">send ln payment</a>

Or even better using an Android Intent:

Intent(Intent.ACTION_SEND).apply {

    data = Uri.parse("lightning:bitanon@getalby.com") 
    //type = "message/rfc822"
    putExtra("comment", "payer@email.com")


The above anchor link works, but does not send comment data to receiving wallet. And I can't get the Android intent to launch wallet app at all. Anyone know how to get this working?

  • Tried "lightning:bitanon@getalby.com?comment=foo"?
    – Mercedes
    Jan 23 at 17:33
  • Yeah, doesn't work.
    – bitanon
    Jan 23 at 18:22

1 Answer 1


The fine folks at Alby helped solve this ->

First, add query intent to manifest:

        <action android:name="android.intent.action.VIEW" />
        <data android:scheme="lightning" />

Second, query getalby.com for encoded lnurl:

val requestUrl = "https://getalby.com/lnurlp/bitanon/callback?amount=1000000&comment=hello" // amount is in millisats
val client = OkHttpClient() 
val request = Request.Builder().url(requestUrl).build() 
val response = client.newCall(request).await()

Third, parse json response for 'pr' which contains encoded lnurl.

Fourth, send Lightning PayRequest Android Intent, which will open with device lightning wallet of your choice:

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

Fifth, parse and handle additional response info, such as transaction verification url etc.

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