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For this quickstart, you will create a minimal Flutter app. Make sure you have Flutter installed.

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Create a New Flutter Project + Crossmint SDK

1

Create a new Flutter app

flutter create crossmint_checkout_quickstart

cd crossmint_checkout_quickstart
2

Install crossmint_flutter

flutter pub add crossmint_flutter
3

Set your environment variables

Pass your API key and configuration via Dart defines:
flutter run \
  --dart-define=CROSSMINT_API_KEY=YOUR_CLIENT_SIDE_API_KEY \
  --dart-define=RECIPIENT_WALLET=YOUR_SOLANA_WALLET_ADDRESS \
  --dart-define=RECEIPT_EMAIL=YOUR_EMAIL@example.com
The receiptEmail field is optional. If the buyer pays with Apple Pay or Google Pay, Crossmint obtains the email automatically. Providing it improves fraud signal quality.
4

Replace lib/main.dart with

import 'package:flutter/material.dart';
import 'package:crossmint_flutter/crossmint_flutter_ui.dart';

const apiKey = String.fromEnvironment('CROSSMINT_API_KEY');
const recipientWallet = String.fromEnvironment('RECIPIENT_WALLET');
const receiptEmail = String.fromEnvironment('RECEIPT_EMAIL');

void main() {
  runApp(const MaterialApp(home: CheckoutScreen()));
}

class CheckoutScreen extends StatelessWidget {
  const CheckoutScreen({super.key});

  @override
  Widget build(BuildContext context) {
    final checkoutController = CrossmintCheckoutController();

    return Scaffold(
      body: SafeArea(
        child: CrossmintEmbeddedCheckout(
          apiKey: apiKey,
          config: CrossmintCheckoutConfig(
            order: CrossmintCheckoutNewOrder.typed(
              lineItems: [
                CrossmintCheckoutLineItem.tokenWithExecutionParameters(
                  tokenLocator:
                      'solana:7EivYFyNfgGj8xbUymR7J4LuxUHLKRzpLaERHLvi7Dgu', // XMEME token (staging)
                  executionParameters: {
                    'mode': 'exact-in',
                    'amount': '1',
                    'maxSlippageBps': '500',
                  },
                ),
              ],
              recipient: CrossmintCheckoutWalletRecipient(
                walletAddress: recipientWallet,
              ),
            ),
            payment: CrossmintCheckoutPayment(
              fiat: CrossmintCheckoutFiatPayment(enabled: true),
              crypto: CrossmintCheckoutCryptoPayment(enabled: false),
              receiptEmail: receiptEmail,
            ),
          ),
          checkoutController: checkoutController,
          onOrderUpdated: (order) =>
              debugPrint('Order updated: ${order['status']}'),
          onOrderCreationFailed: (error) =>
              debugPrint('Error: $error'),
        ),
      ),
    );
  }
}
5

Run your project

Run with the same --dart-define flags from step 3:
flutter run -d ios \
  --dart-define=CROSSMINT_API_KEY=YOUR_CLIENT_SIDE_API_KEY \
  --dart-define=RECIPIENT_WALLET=YOUR_SOLANA_WALLET_ADDRESS \
  --dart-define=RECEIPT_EMAIL=YOUR_EMAIL@example.com