Flutter Integration

Cashfree’s integrity standards

Before proceeding with the SDK integration, please ensure that your application complies with Cashfree’s Integrity. Applications that don’t meet the required integrity standards may be restricted from using production services.For further guidance, refer to the Cashfree Integrity.

Setting up SDK

The Flutter SDK is hosted on pub dev.You can get the sdk here.
Our Flutter SDK supports Android SDK version 19 and above and iOS minimum deployment target of 11 and above. Open your project’s pubspec.yaml and add the following under dependencies: flutter_cashfree_pg_sdk: 2.2.9+47

iOS

Add this to your application’s info.plist file.

<key>LSApplicationQueriesSchemes</key>
<array>
  <string>phonepe</string>
  <string>tez</string>
  <string>paytmmp</string>
  <string>bhim</string>
  <string>amazonpay</string>
  <string>credpay</string>
</array>

Step 1: Creating an order

The first step in the Cashfree Payment Gateway integration is to create an Order. You need to do this before any payment can be processed. You can add an endpoint to your server which creates this order and is used for communication with your frontend.

API Request for creating an order

Here’s a sample request for creating an order using your desired backend language. Cashfree offers backend SDKs to simplify the integration process. You can find the SDKs here.

import { Cashfree, CFEnvironment } from "cashfree-pg";

const cashfree = new Cashfree(
	CFEnvironment.PRODUCTION,
	"{Client ID}",
	"{Client Secret Key}"
);

function createOrder() {
	var request = {
		order_amount: "1",
		order_currency: "INR",
		customer_details: {
			customer_id: "node_sdk_test",
			customer_name: "",
			customer_email: "example@gmail.com",
			customer_phone: "9999999999",
		},
		order_meta: {
			return_url:
				"https://test.cashfree.com/pgappsdemos/return.php?order_id=order_123",
		},
		order_note: "",
	};

	cashfree
		.PGCreateOrder(request)
		.then((response) => {
			var a = response.data;
			console.log(a);
		})
		.catch((error) => {
			console.error("Error setting up order request:", error.response.data);
		});
}

After successfully creating an order, you will receive a unique order_id and payment_session_id that you need for subsequent steps. You can view all the complete api request and response for /orders here.

Step 2: Opening the payment page

Web Checkout is a streamlined payment solution that integrates Cashfree’s payment gateway into your iOS app through our SDK. This implementation uses a WebView to provide a secure, feature-rich payment experience. Your customers are presented with a familiar web interface where they can enter their payment details and complete their transaction seamlessly. All payment logic, UI components, and security measures are managed by our SDK, eliminating the need for complex custom implementation. To complete the payment, we can follow the following steps:

Create a CFSession object.
Create a Web Checkout Payment object.
Set payment callback.
Initiate the payment using the payment object created

Create a session

This object contains essential information about the order, including the payment session ID (payment_session_id) and order ID (order_id) obtained from Step 1. It also specifies the environment (sandbox or production).

try {
    var session = CFSessionBuilder().setEnvironment(environment).setOrderId(orderId).setPaymentSessionId(paymentSessionId).build();
    return session;
} on CFException catch (e) {
    print(e.message);
}

Create a web checkout payment object

Use CFWebCheckoutPaymentBuilder to create the payment object. This object acceps a CFSession, like the one created in the previous step.

var cfWebCheckout = CFWebCheckoutPaymentBuilder()
  .setSession(session!)
  .build();

Setup callback

You need to set up callback handlers to handle events after payment processing.

void verifyPayment(String orderId) {
    print("Verify Payment");
  }

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

var cfPaymentGatewayService = CFPaymentGatewayService();

  @override
  void initState() {
    super.initState();
    cfPaymentGatewayService.setCallback(verifyPayment, onError);
}

Step 3: Sample Code

class _MyAppState extends State<MyApp> {

  var cfPaymentGatewayService = CFPaymentGatewayService();

  @override
  void initState() {
    super.initState();
    cfPaymentGatewayService.setCallback(verifyPayment, onError);
  }

  void verifyPayment(String orderId) {
    print("Verify Payment");
  }

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

  webCheckout() async {
    try {
      var session = createSession();
      var cfWebCheckout = CFWebCheckoutPaymentBuilder().setSession(session!).build();
      cfPaymentGatewayService.doPayment(cfWebCheckout);
    } on CFException catch (e) {
      print(e.message);
    }

  }

  CFSession? createSession() {
    try {
      var session = CFSessionBuilder().setEnvironment(environment).setOrderId(orderId).setPaymentSessionId(paymentSessionId).build();
      return session;
    } on CFException catch (e) {
      print(e.message);
    }
    return null;
  }
}

Step 4: Confirming the payment

Once the payment is completed, you need to confirm whether the payment was successful by checking the order status. Once the payment finishes, the user will be redirected back to your activity.

Ensure you check the order status from your server endpoint.

To verify an order you can call our /pg/orders endpoint from your backend. You can also use our SDK to achieve the same.

version := "2023-08-01"
response, httpResponse, err := cashfree.PGFetchOrder(&version, "<order_id>", nil, nil, nil)
if err != nil {
	fmt.Println(err.Error())
} else {
	fmt.Println(httpResponse.StatusCode)
	fmt.Println(response)
}

Testing

You should now have a working checkout button that redirects your customer to Cashfree payment page. If your integration isn’t working:

Open the Network tab in your browser’s developer tools.
Click the button and check the console logs.
Use console.log(session) inside your button click listener to confirm the correct error returned.

Error codes

To confirm the error returned in your application, you can view the error codes that are exposed by the SDK.

Show list of error codes

The following are some of the error codes that are exposed by the SDK:

ERROR CODES	MESSAGE
MISSING_CALLBACK	The callback is missing in the request.
ORDER_ID_MISSING	The “order_id” is missing in the request.
CARD_EMI_TENURE_MISSING	The “emi_tenure” is missing or invalid (It has to be greater than 0).
INVALID_UPI_APP_ID_SENT	The id sent is invalid. The value has to be one of the following: “tez://”,“phonepe://”,“paytm://”,“bhim://. Please refer the note in CFUPI class for more details
INVALID_PAYMENT_OBJECT_SENT	The payment object that is set does not match any payment mode. Please set the correct payment mode and try again.
WALLET_OBJECT_MISSING	The CFWallet object is missing in the request
NETBANKING_OBJECT_MISSING	The CFNetbanking object is missing in the request.
UPI_OBJECT_MISSING	The CFUPI object is missing in the request.
CARD_OBJECT_MISSING	The CFCard object is missing in the request.
INVALID_WEB_DATA	The url seems to be corrupt. Please reinstantiate the order.
SESSION_OBJECT_MISSING	The “session” is missing in the request
PAYMENT_OBJECT_MISSING	The “payment” is missing in the request
ENVIRONMENT_MISSING	The “environment” is missing in the request.
ORDER_TOKEN_MISSING	The “order_token” is missing in the request.
CHANNEL_MISSING	The “channel” is missing in the request.
CARD_NUMBER_MISSING	The “card_number” is missing in the request.
CARD_EXPIRY_MONTH_MISSING	The “card_expiry_mm” is missing in the request.
CARD_EXPIRY_YEAR_MISSING	The “card_expiry_yy” is missing in the request.
CARD_CVV_MISSING	The “card_cvv” is missing in the request.
UPI_ID_MISSING	The “upi_id” is missing in the request
WALLET_CHANNEL_MISSING	The “channel” is missing in the wallet payment request
WALLET_PHONE_MISSING	The “phone number” is missing in the wallet payment request
NB_BANK_CODE_MISSING	The “bank_code” is missing in the request

Payments

Payment Gateway

Checkout

Cross Border Payments

Flowwise

RiskShield

Subscription

Other Products

Developer updates

Flutter Integration

Cashfree’s integrity standards

Setting up SDK

iOS

Step 1: Creating an order

API Request for creating an order

Step 2: Opening the payment page

Create a session

Create a web checkout payment object

Setup callback

Step 3: Sample Code

Step 4: Confirming the payment

Testing

Error codes

Payments

Payment Gateway

Checkout

Cross Border Payments

Flowwise

RiskShield

Subscription

Other Products

Developer updates

​Cashfree’s integrity standards

​Setting up SDK

iOS

​Step 1: Creating an order

API Request for creating an order

​Step 2: Opening the payment page

​Create a session

​Create a web checkout payment object

​Setup callback

​Step 3: Sample Code

​Step 4: Confirming the payment

​Testing

​Error codes

Cashfree’s integrity standards

Setting up SDK

Step 1: Creating an order

Step 2: Opening the payment page

Create a session

Create a web checkout payment object

Setup callback

Step 3: Sample Code

Step 4: Confirming the payment

Testing

Error codes