Step 1: Install the Razorpay Flutter Plugin#

Download the plugin from Pub.dev.

Step 2: Add the Dependencies#

Add the below code to dependencies in your app's pubspec.yml

 Add Dependencies
Copyrazorpay_flutter: 1.1.0

Run flutter packages get in the root directory of your app.

Step 3: Import Package#

Use the below code to import the razorpay_flutter.dart file to your project.

 Import Package
Copyimport 'package:razorpay_flutter/razorpay_flutter.dart';

Step 4: Create Razorpay instance#

Use the below code to create a Razorpay instance.

 Instantiate
Copy_razorpay = Razorpay();

Step 5: Attach Event Listeners#

The plugin uses event-based communication and emits events when payments fail or succeed.

The event names are exposed via the constants EVENT_PAYMENT_SUCCESS, EVENT_PAYMENT_ERROR and EVENT_EXTERNAL_WALLET from the Razorpay class.

Use the on(String event, Function handler) method on the Razorpay instance to attach event listeners.

 Attach Event Listeners
Copy_razorpay.on(Razorpay.EVENT_PAYMENT_SUCCESS, _handlePaymentSuccess);
_razorpay.on(Razorpay.EVENT_PAYMENT_ERROR, _handlePaymentError);
_razorpay.on(Razorpay.EVENT_EXTERNAL_WALLET, _handleExternalWallet);

The handlers would be defined in the class as:

 Handlers
Copyvoid _handlePaymentSuccess(PaymentSuccessResponse response) {
  // Do something when payment succeeds
}

void _handlePaymentError(PaymentFailureResponse response) {
  // Do something when payment fails
}

void _handleExternalWallet(ExternalWalletResponse response) {
  // Do something when an external wallet is selected
}

To clear event listeners, use the clear method on the Razorpay instance.

 Clear Event Listeners
Copy_razorpay.clear(); // Removes all listeners

Step 6: Create an Order in Server#

Orders API helps to prevent multiple payments by binding a single successful payment to an order.

Sample Code#

The following is a sample API request and response for creating an order:

 cURL Java Python PHP .NET Ruby Node.JS Response
Copycurl  -X POST https://api.razorpay.com/v1/orders
-H 'content-type:application/json'
-d '{
    "amount": 50000,
    "currency": "INR",
    "receipt": "rcptid_11"
}'
Copytry {
  JSONObject orderRequest = new JSONObject();
  orderRequest.put("amount", 50000); // amount in the smallest currency unit
  orderRequest.put("currency", "INR");
  orderRequest.put("receipt", "order_rcptid_11");

  Order order = razorpay.Orders.create(orderRequest);
} catch (RazorpayException e) {
  // Handle Exception
  System.out.println(e.getMessage());
}
Copyorder_amount = 50000
order_currency = 'INR'
order_receipt = 'order_rcptid_11'
notes = {'Shipping address': 'Bommanahalli, Bangalore'}   # OPTIONAL

client.order.create(amount=order_amount, currency=order_currency, receipt=order_receipt, notes=notes)
Copy$order  = $client->order->create([
  'receipt'         => 'order_rcptid_11',
  'amount'          => 50000, // amount in the smallest currency unit
  'currency'        => 'INR'// <a href="/docs/international-payments/#supported-currencies" target="_blank">See the list of supported currencies</a>.)
]);
CopyDictionary<string, object> options = new Dictionary<string,object>();
options.Add("amount", 50000); // amount in the smallest currency unit
options.add("receipt", "order_rcptid_11");
options.add("currency", "INR");
Order order = client.Order.Create(options);
Copyoptions = amount: 50000, currency: 'INR', receipt: '<order_rcptid_11>'
order = Razorpay::Order.create
Copyvar options = {
  amount: 50000,  // amount in the smallest currency unit
  currency: "INR",
  receipt: "order_rcptid_11"
};
instance.orders.create(options, function(err, order) {
  console.log(order);
});
Copy{
    "id": "order_DBJOWzybf0sJbb",
    "entity": "order",
    "amount": 50000,
    "amount_paid": 0,
    "amount_due": 50000,
    "currency": "INR",
    "receipt": "rcptid_11",
    "status": "created",
    "attempts": 0,
    "notes": [],
    "created_at": 1566986570
}

Parameters#

Here is the list of parameters for creating the order:

amount mandatory

integer The transaction amount, expressed in the currency subunit, such as paise (in case of INR). For example, for an actual amount of ₹299.35, the value of this field should be 29935.

currency mandatory

string The currency in which the transaction should be made. See the list of supported currencies.

receipt optional

string Your receipt id for this order should be passed here. Maximum length 40 characters.

notes optional

json object Key-value pair that can be used to store additional information about the entity. Maximum 15 key-value pairs, 256 characters (maximum) each. For example, "note_key": "Beam me up Scotty”.

A successful creation of the Order returns the order_id that you need to store against the Order defined in your system.

Step 7: Add Checkout Options#

Pass the Checkout options. Ensure that you pass the order_id that you received in the response of the previous step.

 Checkout Options
Copyvar options = {
  'key': '<YOUR_KEY_ID>',
  'amount': 50000, //in the smallest currency sub-unit.
  'name': 'Acme Corp.',
  'order_id': 'order_EMBFqjDHEEn80l', // Generate order_id using Orders API
  'description': 'Fine T-Shirt',
  'timeout': 60, // in seconds
  'prefill': {
    'contact': '9123456789',
    'email': 'gaurav.kumar@example.com'
  }
};

Step 8: Open Checkout#

Use the below code to open the Razorpay checkout.

 Open Razorpay Checkout
Copy_razorpay.open(options);

Step 9: Store Fields in Server#

A successful payment returns the following fields to the Checkout Form. Make provisions to store these fields on your server. You can confirm the authenticity of these details by verifying the signature in the next step.

 Success Callback
Copy{
  "razorpay_payment_id": "pay_29QQoUBi66xm2f",
  "razorpay_order_id": "order_9A33XWu170gUtm",
  "razorpay_signature": "9ef4dffbfd84f1318f6739a3ce19f9d85851857ae648f114332d8401e0949a3d"
}

razorpay_payment_id

string Unique identifier for the payment returned by Checkout only for successful payments.

razorpay_order_id

string Unique identifier for the order returned by Checkout.

razorpay_signature

string Signature returned by the checkout. This is used to verify the payment.

Step 10: Verify Payment Signature#

This is a mandatory step that allows you to confirm the authenticity of the details returned to the Checkout form for successful payments.

To verify the razorpay_signature returned to you by the Checkout form:

1. Create a signature in your server using the following attributes:

   • order_id - Retrieve the order_id from your server. Do not use the razorpay_order_id returned by Checkout.
   • razorpay_payment_id - Returned by Checkout.
   • key_secret - Available in your server.
     The key_secret that was generated from the Dashboard.

2. Use the SHA256 algorithm, the razorpay_payment_id and the order_id to construct a HMAC hex digest as shown below:

   Copygenerated_signature = hmac_sha256(order_id + "|" + razorpay_payment_id, secret);
   
     if (generated_signature == razorpay_signature) {
       payment is successful
     }
   

3. If the signature you generate on your server matches the razorpay_signature returned to you by the Checkout form, the payment received is from an authentic source.

Generate Signature on your Server#

 Java PHP Ruby Python
Copy/**
* This class defines common routines for generating
* authentication signatures for Razorpay Webhook requests.
*/
public class Signature
{
    private static final String HMAC_SHA256_ALGORITHM = "HmacSHA256";
    /**
    * Computes RFC 2104-compliant HMAC signature.
    * * @param data
    * The data to be signed.
    * @param key
    * The signing key.
    * @return
    * The Base64-encoded RFC 2104-compliant HMAC signature.
    * @throws
    * java.security.SignatureException when signature generation fails
    */
    public static String calculateRFC2104HMAC(String data, String secret)
    throws java.security.SignatureException
    {
        String result;
        try {

            // get an hmac_sha256 key from the raw secret bytes
            SecretKeySpec signingKey = new SecretKeySpec(secret.getBytes(), HMAC_SHA256_ALGORITHM);

            // get an hmac_sha256 Mac instance and initialize with the signing key
            Mac mac = Mac.getInstance(HMAC_SHA256_ALGORITHM);
            mac.init(signingKey);

            // compute the hmac on input data bytes
            byte[] rawHmac = mac.doFinal(data.getBytes());

            // base64-encode the hmac
            result = DatatypeConverter.printHexBinary(rawHmac).toLowerCase();

        } catch (Exception e) {
            throw new SignatureException("Failed to generate HMAC : " + e.getMessage());
        }
        return result;
    }
}
Copyuse Razorpay\Api\Api;
$api = new Api($key_id, $key_secret);
$attributes  = array('razorpay_signature'  => '23233',  'razorpay_payment_id'  => '332' ,  'order_id' => '12122');
$order  = $api->utility->verifyPaymentSignature($attributes)
Copyrequire 'razorpay'
Razorpay.setup('key_id', 'key_secret')
payment_response = {
  'order_id': '12122',
  'razorpay_payment_id': '332',
  'razorpay_signature': '23233'
}

Razorpay::Utility.verify_payment_signature(payment_response)
Copyimport razorpay

client = razorpay.Client(auth = ('<key_id>', '<key_secret>'))
params_dict = {
    'order_id': '12122',
    'razorpay_payment_id': '332',
    'razorpay_signature': '23233'
}
client.utility.verify_payment_signature(params_dict)

Post Signature Verification#

After verifying the signature, fetch the order in your system that corresponds to the razorpay_order_id in your database. Mark it as successful and process the order.

Test Payments#

You can make test payments using any of the payment methods configured on the Checkout. No money is deducted from the customer's account as this is a simulated transaction. In the Checkout code, ensure that you have entered the API keys generated in the test mode.

Test Cards#

You can use any of the test cards to make transactions in the test mode. Use any valid expiration date in the future and any random CVV to create a successful payment.

Verify the Payment Status#

You can track the status of the payment from the Dashboard or subscribe to the Webhook event or poll our APIs.

From the Dashboard#

1. Log into your Dashboard and navigate to Transactions → Payments.
2. Look if a payment_ID has been generated. If no payment_ID has been generated, it means that the transaction has failed.

Subscribe to Webhook events#

You can subscribe to a Webhook event that is generated when a certain event happens in our server. When one of those events is triggered, Razorpay sends the Webhook payload to the configured URL.

When the customer makes a successful payment on the Checkout, payment.authorized event is created in Razorpay.

Poll APIs#

You can retrieve the status of the payments by polling our Payment APIs.

Accept Live Payments#

After testing the flow of funds end-to-end in test mode, you are now ready to take your integration live. Once you are confident that the integration is working fine, you can switch to the live mode and start accepting payments from customers. But first, you need to swap the test API keys with the live keys.

To generate API key in live mode:

1. Log into Dashboard and switch to Live mode on the menu.
2. Navigate to Settings → API Keys → Generate Key to generate API key for live mode.
3. Download the keys and save it securely.
4. Replace the test API key with the Live Key in the Checkout code and start accepting real-time payments.