Flutter Subscription Integration

flutter_cashfree_pg_sdk: 2.4.0+52

<application
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name">

    <meta-data
        android:name="cashfree_subscription_flow_enable"
        android:value="true"
        tools:replace="android:value"/>
</application>

<key>LSApplicationQueriesSchemes</key>
<array>
  <string>amazonpay</string>
  <string>upi</string>
  <string>credpay</string>
  <string>bhim</string>
  <string>paytmmp</string>
  <string>phonepe</string>
  <string>tez</string>
  <string>navipay</string>
  <string>mobikwik</string>
  <string>myairtel</string>
  <string>popclubapp</string>
  <string>super</string>
  <string>kiwi</string>
  <string>simplypayupi</string>
  <string>whatsapp</string>
</array>

Future<CFSubscriptionSession?> createSubscriptionSession() async {
  try {
    var session = CFSubscriptionSessionBuilder()
        .setEnvironment(environment)
        .setSubscriptionId(subscriptionId)
        .setSubscriptionSessionId(subscriptionSessionId)
        .build();
    return session;
  } on CFException catch (e) {
    print(e.message);
  }
  return null;
}

void onSubscriptionVerify(String subscriptionId) {
  // Verify subscription status from your backend before proceeding.
  print("Verify Subscription: $subscriptionId");
}

void onSubscriptionFailure(CFErrorResponse errorResponse, String orderId) {
  // Handle payment failure. Inspect errorResponse for details.
  print(errorResponse.getMessage());
}

var cfPaymentGatewayService = CFPaymentGatewayService();

@override
void initState() {
  super.initState();
  cfPaymentGatewayService.setCallback(onSubscriptionVerify, onSubscriptionFailure);
}

cfPaymentGatewayService.doPayment(subsCardPayment);
// or: cfPaymentGatewayService.doPayment(subsUPIPayment);
// or: cfPaymentGatewayService.doPayment(subsNetbankingPayment);

class _MyAppState extends State<MyApp> {

  var cfPaymentGatewayService = CFPaymentGatewayService();

  @override
  void initState() {
    super.initState();
    cfPaymentGatewayService.setCallback(onSubscriptionVerify, onSubscriptionFailure);
  }

  void onSubscriptionVerify(String subscriptionId) {
    print("Verify Subscription: $subscriptionId");
  }

  void onSubscriptionFailure(CFErrorResponse errorResponse, String orderId) {
    print(errorResponse.getMessage());
    print("Error while making payment");
  }

  subsCardPay() async {
    try {
      cfPaymentGatewayService.setCallback(onSubscriptionVerify, onSubscriptionFailure);
      var session = await createSubscriptionSession();
      if (session == null) {
        return;
      }
      var subsCard = CFSubsCardBuilder()
          .setCardNumber(cardNumber)
          .setCardHolderName(cardHolderName)
          .setCardExpiryMM(cardExpiryMM)
          .setCardExpiryYY(cardExpiryYY)
          .setCardCVV(cardCVV)
          .build();
      var subsCardPayment = CFSubsCardPaymentBuilder()
          .setSession(session)
          .setCard(subsCard)
          .build();
      cfPaymentGatewayService.doPayment(subsCardPayment);
    } on CFException catch (e) {
      print(e.message);
    }
  }

  Future<CFSubscriptionSession?> createSubscriptionSession() async {
    try {
      var session = CFSubscriptionSessionBuilder()
          .setEnvironment(environment)
          .setSubscriptionId(subscriptionId)
          .setSubscriptionSessionId(subscriptionSessionId)
          .build();
      return session;
    } on CFException catch (e) {
      print(e.message);
    }
    return null;
  }
}