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This guide shows you how to enroll and manage payment methods using the Flutter Lite SDK. You’ll learn how to configure the SDK for card management, save customer cards securely, and retrieve saved payment methods.
Card enrollment and management features are available in the Lite version (tonder_sdk_lite) of the Flutter SDK. This allows you to build a custom UI for saving cards.

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Prerequisites

Before you can enroll payment methods with the Tonder Flutter Lite SDK, ensure you have completed the necessary setup and have the required components in place.
  • You are using the LiteCheckout from the tonder_sdk_lite package.
  • Your backend is set up to provide a Secure Token for card management.

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Payment Method Enrollment Steps

Follow these steps to implement payment method enrollment in your Flutter application. This process involves configuring the SDK with secure tokens, collecting card data through your custom UI, and securely saving the payment method for future use.

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Step 1: Configure the SDK with a Secure Token

Initialize the LiteCheckout instance and configure it with the customer’s email and the secure token obtained from your backend. This configuration enables secure card management operations. 
import 'package:tonder_sdk_lite/lite_checkout.dart';

class EnrollmentWidget extends StatefulWidget {
  @override
  _EnrollmentWidgetState createState() => _EnrollmentWidgetState();
}

class _EnrollmentWidgetState extends State<EnrollmentWidget> {
  late LiteCheckout _liteCheckout;

  @override
  void initState() {
    super.initState();
    
    _liteCheckout = LiteCheckout(
      apiKey: "YOUR_API_KEY",
      returnUrl: "YOUR_RETURN_URL",
    );
    
    // Configure with customer email and secure token
    _initializeEnrollment();
  }
  
  Future<void> _initializeEnrollment() async {
    final secureToken = await getSecureTokenFromBackend();
    
    _liteCheckout.configureCheckout(
      customerEmail: 'customer@example.com',
      secureToken: secureToken,
    );
  }
  
  // ... rest of your widget
}

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Step 2: Build Your Custom Card Enrollment Form

Create your own card enrollment form using standard Flutter widgets to collect card information. 

class _EnrollmentWidgetState extends State<EnrollmentWidget> {
  late LiteCheckout _liteCheckout;
  
  // Controllers for card input fields
  final _cardNumberController = TextEditingController();
  final _cardHolderController = TextEditingController();
  final _expiryMonthController = TextEditingController();
  final _expiryYearController = TextEditingController();
  final _cvvController = TextEditingController();
  
  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Text('Save Your Card', style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold)),
        SizedBox(height: 20),
        
        TextField(
          controller: _cardHolderController,
          decoration: InputDecoration(labelText: 'Cardholder Name'),
        ),
        TextField(
          controller: _cardNumberController,
          decoration: InputDecoration(labelText: 'Card Number'),
          keyboardType: TextInputType.number,
        ),
        Row(
          children: [
            Expanded(
              child: TextField(
                controller: _expiryMonthController,
                decoration: InputDecoration(labelText: 'Month (MM)'),
                keyboardType: TextInputType.number,
              ),
            ),
            SizedBox(width: 16),
            Expanded(
              child: TextField(
                controller: _expiryYearController,
                decoration: InputDecoration(labelText: 'Year (YY)'),
                keyboardType: TextInputType.number,
              ),
            ),
          ],
        ),
        TextField(
          controller: _cvvController,
          decoration: InputDecoration(labelText: 'CVV'),
          keyboardType: TextInputType.number,
          obscureText: true,
        ),
        SizedBox(height: 20),
        ElevatedButton(
          onPressed: _saveCard,
          child: Text('Save Card'),
        ),
      ],
    );
  }
}

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Step 3: Save the Customer Card

Use the saveCustomerCard method to tokenize and save the card details collected from your custom UI. This method securely processes the card information and stores it for future transactions. 

Future<void> _saveCard() async {
  final cardData = {
    'card_number': _cardNumberController.text,
    'cardholder_name': _cardHolderController.text,
    'expiration_month': _expiryMonthController.text,
    'expiration_year': _expiryYearController.text,
    'cvv': _cvvController.text,
  };
  
  try {
    final response = await _liteCheckout.saveCustomerCard(cardData);
    print('Card saved successfully: $response');
    
    // Show success message
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text('Card saved successfully!')),
    );
  } catch (error) {
    print('Error saving card: $error');
    
    // Show error message
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text('Failed to save card: $error')),
    );
  }
}

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Step 4: Retrieve Saved Cards

Use the getCustomerCards method to retrieve all saved payment methods for the configured customer. This allows you to display saved cards in your custom UI. 

Future<void> _loadSavedCards() async {
  try {
    final cards = await _liteCheckout.getCustomerCards();
    print('Saved cards: $cards');
    
    setState(() {
      // Update your UI with the saved cards
    });
  } catch (error) {
    print('Error loading cards: $error');
  }
}

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Step 5: Remove a Saved Card

Use the removeCustomerCard method to delete a previously saved card using its unique ID. This provides customers with control over their saved payment methods. 

Future<void> _removeCard(String cardId) async {
  try {
    await _liteCheckout.removeCustomerCard(cardId);
    print('Card removed successfully');
    
    // Refresh your card list
    _loadSavedCards();
    
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text('Card removed successfully!')),
    );
  } catch (error) {
    print('Error removing card: $error');
  }
}

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Next Steps

Now that you’ve successfully implemented payment method enrollment in your Flutter app, explore these advanced features to enhance your payment experience: