Mobile elements - Customer Sheet

Let customers manage their own payments.#

Important the customer sheet is in Beta so it is not guaranteed to work under all circumstances.

1. Set up Stripe [Server Side] [Client Side]#

First, you need a Stripe account. Register now.

Server-side#

This integration requires endpoints on your server that talk to the Stripe API. Use one official libraries for access to the Stripe API from your server. Follow the steps here

Client-side#

The Flutter SDK is open source, fully documented.

To install the SDK, follow these steps:

Run the commmand flutter pub add flutter_stripe
This will add a line like this to your project's pubspec.yaml with the latest package version

For details on the latest SDK release and past versions, see the Releases page on GitHub. To receive notifications when a new release is published, watch releases for the repository.

When your app starts, configure the SDK with your Stripe publishable key so that it can make requests to the Stripe API.

void main() async {
  Stripe.publishableKey = stripePublishableKey;
  runApp(const App());
}

Use your test mode keys while you test and develop, and your live mode keys when you publish your app.

2. Add an enpoint [Server Side]#

First, you need a Stripe account. Register now.

Server-side#

This integration uses three Stripe API objects:

A PaymentIntent. Stripe uses this to represent your intent to collect payment from a customer, tracking your charge attempts and payment state changes throughout the process.
A Customer (optional). To set up a card for future payments, it must be attached to a Customer. Create a Customer object when your customer creates an account with your business. If your customer is making a payment as a guest, you can create a Customer object before payment and associate it with your own internal representation of the customer’s account later.
A Customer Ephemeral Key (optional). Information on the Customer object is sensitive, and can’t be retrieved directly from an app. An Ephemeral Key grants the SDK temporary access to the Customer.

If you never save cards to a Customer and don’t allow returning Customers to reuse saved cards, you can omit the Customer and Customer Ephemeral Key objects from your integration.

For security reasons, your app can’t create these objects. Instead, add an endpoint on your server that:

Retrieves the Customer, or creates a new one.
Creates an Ephemeral Key for the Customer.
Creates a PaymentIntent, passing the Customer id.
Returns the Payment Intent’s client secret, the Ephemeral Key’s secret, and the Customer’s id to your app.

Check examples implementations for your server here

3. Collect customer details [Client Side]#

First initialize the customer sheet

 Future<void> initCustomerSheet() async {
    try {
      // 1. retrieve customer from backend.
      final data = await _createTestCustomerSheet();

      // create some billingdetails
      final billingDetails = BillingDetails(
        name: 'Flutter Stripe',
        email: 'email@stripe.com',
        phone: '+48888000888',
        address: Address(
          city: 'Houston',
          country: 'US',
          line1: '1459  Circle Drive',
          line2: '',
          state: 'Texas',
          postalCode: '77063',
        ),
      ); // mocked data for tests

      // 2. initialize the customer sheet
      await Stripe.instance.initCustomerSheet(
        customerSheetInitParams: CustomerSheetInitParams(
          // Main params
          setupIntentClientSecret: data['setupIntent'],
          merchantDisplayName: 'Flutter Stripe Store Demo',
          // Customer params
          customerId: data['customer'],
          customerEphemeralKeySecret: data['ephemeralKeySecret'],
          style: ThemeMode.system,
          defaultBillingDetails: billingDetails,
        ),
      );
      setState(() {
        step = 1;
      });
    } catch (e) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Error: $e')),
      );
      rethrow;
    }
  }

Then you can show the customer sheet

 Future<void> confirmCustomerSheet() async {
  try {
    // 3. display the customer sheet.
    final result = await Stripe.instance.presentCustomerSheet();

    setState(() {
      step = 0;
    });

    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(
            'Payment succesfully modified option selected: ${result?.paymentOption?.label}}'),
      ),
    );
  } on Exception catch (e) {
    if (e is StripeException) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('Error from Stripe: ${e.error.localizedMessage}'),
        ),
      );
    } else {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('Unforeseen error: ${e}'),
        ),
      );
    }
  }
}

3. Optional configuration#

Change appearance#

It is possible to change the appearance of the customer sheet.

 await Stripe.instance.initCustomerSheet(      
  appearance: PaymentSheetAppearance(
    colors: PaymentSheetAppearanceColors(
      background: Colors.lightBlue,
      primary: Colors.blue,
      componentBorder: Colors.red,
    ),
    shapes: PaymentSheetShape(
      borderWidth: 4,
      shadow: PaymentSheetShadowParams(color: Colors.red),
    ),
    primaryButton: PaymentSheetPrimaryButtonAppearance(
      shapes: PaymentSheetPrimaryButtonShape(blurRadius: 8),
      colors: PaymentSheetPrimaryButtonTheme(
        light: PaymentSheetPrimaryButtonThemeColors(
          background: Color.fromARGB(255, 231, 235, 30),
          text: Color.fromARGB(255, 235, 92, 30),
          border: Color.fromARGB(255, 235, 92, 30),
        ),
      ),
    ),
  ),      
);