Headless

Hyperswitch is designed to facilitate the integration and management of payment-related functionalities in a decoupled or headless architecture with flexibility to customize your payments experience.

This section guides you through the integration of Hyperswitch Headless for both web and mobile clients

Customize the payment experience using Headless functions

1. Initialize the Hyperswitch SDK

Initialize Hyper onto your app with your publishable key with the Hyper constructor. You’ll use HyperLoader which you can call to create a Headless Payment Session. To get a Publishable Key please find it here.

HTML + JavaScript

// Source Hyperloader on your HTML file using the <script /> tag
hyper = Hyper.init(YOUR_PUBLISHABLE_KEY);

Flutter

// dependencies: flutter_hyperswitch: ^version_number
// run the following command to fetch and install the dependencies flutter pub get
import 'package:flutter_hyperswitch/flutter_hyperswitch.dart';
_hyper.init(HyperConfig(publishableKey: 'YOUR_PUBLISHABLE_KEY'));

2. Create a Payment Intent

Make a request to the endpoint on your server to create a new Payment. The clientSecret returned by your endpoint is used to initialize the payment session.

Important: Make sure to never share your API key with your client application as this could potentially compromise your security

3. Initialize your Payment Session

Initialize a Payment Session by passing the clientSecret to the initPaymentSession

JavaScript

paymentSession = hyper.initPaymentSession({
  clientSecret: client_secret,
});

Flutter

final params = PaymentMethodParams(clientSecret: 'YOUR_PAYMENT_INTENT_CLIENT_SECRET')
Session _sessionId = await hyper.initPaymentSession(params);

options (Required)	Description
clientSecret (string)	Required. Required to use as the identifier of the payment.

4. Craft a customized payments experience

Using the paymentSession object, the default customer payment method data can be fetched, using which you can craft your own payments experience. The paymentSession object also exposes a confirmWithCustomerDefaultPaymentMethod function, using which you can confirm and handle the payment session.

JavaScript

paymentMethodSession = await paymentSession.getCustomerSavedPaymentMethods();

if (paymentMethodSession.error) {
    // handle the case where no default customer payment method is not present
} else {
    // use the customer_default_saved_payment_method_data to fulfill your usecases (render UI)
    const customer_default_saved_payment_method_data =
        paymentMethodSession.getCustomerDefaultSavedPaymentMethodData();
}

//handle press for pay button 
function handlePress() { 
    if (paymentMethodSession.error) {
        // handle the case where no default customer payment method is not present
    } else {
        // use the confirmWithCustomerDefaultPaymentMethod function to confirm and handle the payment session response
        const { error, status } = await
        paymentMethodSession.
            confirmWithCustomerDefaultPaymentMethod({
                confirmParams: {
                    // Make sure to change this to your payment completion page
                    return_url: "https://example.com/complete"
                },
                // if you wish to redirect always, otherwise it is defaulted to "if_required"
                redirect: "always",
            });

        // use error, status to complete the payment journey
        if (error) {
            if (error.message) {
                // handle error messages
                setMessage(error.message);
            } else {
                setMessage("An unexpected error occurred.");
            }
        }
        if (status) {
            // handle payment status
            handlePaymentStatus(status);
        }
    }
}

Flutter

SavedSession? _savedSessionId = await _hyper.getCustomerSavedPaymentMethods(_sessionId!);

// use the customer_default_saved_payment_method_data to fulfill your usecases
final customer_default_saved_payment_method_data = await _hyper.getCustomerDefaultSavedPaymentMethodData(_savedSessionId!);
if (customer_default_saved_payment_method_data != null) {
    final paymentMethod = customer_default_saved_payment_method_data.left;
    if (paymentMethod != null) {
       final card = paymentMethod.left;
       if (card != null) {
          setState(() {
            _defaultPMText = "${card.nickName}  ${card.cardNumber}  ${card.expiryDate}";
          });
       } else {
          final wallet = paymentMethod.right;
          if (wallet != null) {
            setState(() {
              _defaultPMText = wallet.walletType;
            });
          }
       }
    } else {
      final err = customer_default_saved_payment_method_data.right;
      setState(() {
        _defaultPMText = err?.message ?? "No Default Payment Method present";
      });
    }
  }
}

// use the confirmWithCustomerDefaultPaymentMethod function to confirm and handle the payment session response
Future<void> _confirmPayment() async {
  final confirmWithCustomerDefaultPaymentMethodResponse = 
    await _hyper.confirmWithCustomerDefaultPaymentMethod(_savedSessionId!);
  if (confirmWithCustomerDefaultPaymentMethodResponse != null) {
    final message = confirmWithCustomerDefaultPaymentMethodResponse.message;
    if (message.isLeft) {
      _confirmStatusText = "${confirmWithCustomerDefaultPaymentMethodResponse.status.name}\n${message.left!.name}";
    } else {
      _confirmStatusText = "${confirmWithCustomerDefaultPaymentMethodResponse.status.name}\n${message.right}";
    }
  }
}

Payload for confirmWithCustomerDefaultPaymentMethod(payload)

options (Required)	Description
confirmParams (object)	Parameters that will be passed on to the Hyper API.
redirect (string)	(web only) Can be either 'always' or 'if_required' By default, confirmWithCustomerDefaultPaymentMethod() will always redirect to your return_url after a successful confirmation. If you set redirect: "if_required", then this method will only redirect if your user chooses a redirection-based payment method.

ConfirmParams object

confirmParams	Description
return_url(string)	(web only) The url your customer will be directed to after they complete payment.