.js

function onSuccess(args: [args: string | {
    paymentId: string;
    hash?: string | undefined;
}]){ 
window.location.href =
                `intent://callback?status=success&payment_id=${args.paymentId}#Intent;scheme=coinflow_demo;package=com.example.coinflow_demo;end;`}
}

// IFRAME on your website checkout page
<iframe
… other props
       src={‘url for coinflow checkout’}
        onLoad={() => {
          window.addEventListener(‘message’, event => {
            if (event.data === ‘success’) onSuccess()
          });
        }}
      />

acitivity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <!-- No WebView needed anymore -->

</androidx.constraintlayout.widget.ConstraintLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.coinflow_demo">

    <!-- Permission to access the internet -->
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.AppCompat.Light.DarkActionBar"
        android:usesCleartextTraffic="true"
        >
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
                <data android:scheme="coinflow_demo" />
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity.kt

package com.example.coinflow_demo

import android.content.Intent
import android.net.Uri
import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.browser.customtabs.CustomTabsIntent

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Handle normal app launch
        if (Intent.ACTION_MAIN == intent.action) {
            launchCustomTab("url here")
        }

        // Handle any deep links that launched the app
        handleIntent(intent)
    }

    override fun onNewIntent(intent: Intent) {
        super.onNewIntent(intent)
        handleIntent(intent)
    }

    private fun handleIntent(intent: Intent) {
        val appLinkAction = intent.action
        val appLinkData: Uri? = intent.data

        if (Intent.ACTION_VIEW == appLinkAction && appLinkData != null) {
            val scheme = appLinkData.scheme
            val host = appLinkData.host

            if (scheme == "coinflow_demo" && host == "callback") {
                val status = appLinkData.getQueryParameter("status")
                val paymentId = appLinkData.getQueryParameter("payment_id")

                Toast.makeText(this, paymentId, Toast.LENGTH_LONG).show()


                if (status == "success") {
                    handleSuccessCallback()
                }
            }
        }
    }

    private fun handleSuccessCallback() {
        // Handle success event here
        Toast.makeText(this, "Transaction successful!", Toast.LENGTH_LONG).show()
        // Update UI, navigate to success screen, etc.
    }

    private fun launchCustomTab(url: String) {
        val customTabsIntent = CustomTabsIntent.Builder()
            .setShowTitle(true)
            .build()

        customTabsIntent.launchUrl(this, Uri.parse(url))
    }
}