Razorpay with Android in Kotlin

Overview

Razorpay is basically used to conduct various type of transactions.

Follow the following steps

• Create your merchant in Razorpay and download Key ID and Key Secret from the following link
• https://dashboard.razorpay.com/app/keys
  
• Download "checkout-1.6.15.aar" from Maven website and put it inside "libs" folder of the project
• Add the required dependency in gradle.build (Module) file

 implementation "com.razorpay:checkout:1.6.12"

• Add the following code in proguard-rules.pro

 -keepclassmembers class * {
    @android.webkit.JavascriptInterface <methods>;
 }

 -keepattributes JavascriptInterface
 -keepattributes *Annotation*

 -dontwarn com.razorpay.**
 -keep class com.razorpay.** {*;}

 -optimizations !method/inlining/*

 -keepclasseswithmembers class * {
  public void onPayment*(...);
 }

• Create an Order in Server
• Initiate Payment

 class MainActivity : AppCompatActivity() , PaymentResultListener
 {

    private var broadcastReceiver : RzpTokenReceiver? = null

    companion object
    {
        const val TAG = "MainActivity"
    }

    override fun onCreate(savedInstanceState : Bundle?)
    {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        Checkout.preload(applicationContext)
        broadcastReceiver = RzpTokenReceiver()
    }

    override fun onStart()
    {
        super.onStart()
        btnPay.setOnClickListener {
            payWithRazorpay()
        }
    }

    override fun onResume()
    {
        super.onResume()
        val intentFilter = IntentFilter()
        intentFilter.addAction("rzp.device_token.share")
        registerReceiver(broadcastReceiver , intentFilter)
    }

    private fun payWithRazorpay()
    {
        val checkout = Checkout().apply {
            setKeyID("rzp_test_A5BBPhdwQangOg")
        }
        val activity : MainActivity = this
        try
        {
            val options : JSONObject = JSONObject().apply {
                put("name" , "Raj Kanchan")
                put("description" , "Reference No #123456")
                put(
                    "image" , "https://s3.amazonaws.com/rzp-mobile/images/rzp.png"
                ); //put("order_id" , "order_DBJOWzybf0sJbb")
                put("theme.color" , "#3399cc")
                put("currency" , "INR")
                put("amount" , "500")
                put("prefill.email" , "iamraajkanchan@gmail.com");
                put("prefill.contact" , "7718881920")
                val retry = JSONObject().apply {
                    put("enabled" , true)
                    put("max_count" , 3)
                }
                put("retry" , retry)
            }
            checkout.open(activity , options)
        } catch (e : Exception)
        {
            Log.d(TAG , "payWithRazorpay :: Error : $e")
        }
    }

    override fun onPaymentSuccess(s : String?)
    {
        tvNotification.text = "Successful Payment ID : $s"
    }

    override fun onPaymentError(i : Int , s : String?)
    {
        tvNotification.text = "Failed and cause is : $s"
    }
 }

 class RzpTokenReceiver : BroadcastReceiver()
 {
    override fun onReceive(context : Context? , intent : Intent?)
    {
        if (intent?.equals("rzp.device_token.share") == true)
        {
            Toast.makeText(context , "Switching to Razorpay" , Toast.LENGTH_LONG).show()
        }
    }
 }

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

    <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.Razorpay_Android">
        <receiver
                android:name="com.example.razorpay_android.RzpTokenReceiver"
                android:enabled="true"
                android:exported="false">
            <intent-filter>
                <action android:name="rzp.device_token.share" />
            </intent-filter>
        </receiver>

        <activity
                android:name=".MainActivity"
                android:configChanges="keyboard|keyboardHidden|orientation|screenSize"
                android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

 </manifest>

• Follow the first link of reference

References

1. https://razorpay.com/docs/payment-gateway/android-integration/standard/
   
2. https://github.com/razorpay/razorpay-android-sample-app/issues/248