Moyasar Flutter SDK

Accept payments in your Flutter app through Apple Pay, Samsung Pay, STC Pay, and Credit Card — with the 3DS step handled for you.

Method	Platforms	Widget
Credit Card (with managed 3DS)	iOS, Android	CreditCard
Apple Pay	iOS	ApplePay
Samsung Pay	Android (Samsung devices)	SamsungPay
STC Pay	iOS, Android	STCPay

Every widget hides itself when its method isn't available on the device, so you can drop them all into one screen without platform checks.

Install

flutter pub add moyasar

Requires Flutter >=1.17.0, Dart >=2.18.2 <4.0.0, and iOS 12.0+. You'll need a Moyasar account — get your API keys.

Quick start

import 'package:flutter/material.dart';
import 'package:moyasar/moyasar.dart';

class Checkout extends StatelessWidget {
  Checkout({super.key});

  final paymentConfig = PaymentConfig(
    publishableApiKey: 'YOUR_PUBLISHABLE_API_KEY',
    amount: 25758, // SAR 257.58 — smallest currency unit (1 SAR = 100 halalas)
    description: 'Order #1324',
    creditCard: CreditCardConfig(saveCard: false, manual: false),
    applePay: ApplePayConfig(
      merchantId: 'YOUR_APPLE_MERCHANT_ID',
      label: 'YOUR_STORE_NAME',
      manual: false,
      saveCard: false,
    ),
    samsungPay: SamsungPayConfig(
      serviceId: 'YOUR_SAMSUNG_SERVICE_ID',
      merchantName: 'YOUR_STORE_NAME',
    ),
  );

  void onPaymentResult(result) {
    if (result is PaymentResponse && result.status == PaymentStatus.paid) {
      // Verify on your backend before fulfilling the order.
    }
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        ApplePay(config: paymentConfig, onPaymentResult: onPaymentResult),
        SamsungPay(config: paymentConfig, onPaymentResult: onPaymentResult),
        CreditCard(config: paymentConfig, onPaymentResult: onPaymentResult),
      ],
    );
  }
}

A widget requires its matching config: ApplePay needs applePay, SamsungPay needs samsungPay.

Handling the result

onPaymentResult receives either a PaymentResponse or an error. Always check the type first:

void onPaymentResult(result) {
  if (result is PaymentResponse) {
    switch (result.status) {
      case PaymentStatus.paid:
        // Charged. Verify on your backend before fulfilling.
        break;
      case PaymentStatus.authorized:
      case PaymentStatus.captured:
        // Manual capture flow: funds held, then taken.
        break;
      case PaymentStatus.initiated:
        // Awaiting the 3DS step or an OTP.
        break;
      case PaymentStatus.failed:
        // Declined.
        break;
    }
    return;
  }

  if (result is PaymentCanceledError) {
    // The user dismissed the payment sheet.
  } else if (result is ValidationError) {
    // Invalid input — inspect result.errors.
  } else if (result is NetworkError || result is TimeoutError) {
    // Connectivity problem; let the user retry.
  }
}

Error type	Meaning
PaymentCanceledError	The user dismissed the payment sheet.
UnprocessableTokenError	The wallet returned an empty or unusable token.
ValidationError	Invalid request data. Has message and errors.
AuthError	The publishable API key was rejected.
ApiError	Moyasar returned a server-side error.
NetworkError / TimeoutError	The request never completed.
UnspecifiedError	Anything else.

Per-method details (masked card number, STC message, 3DS URL) live on result.source.

Apple Pay

1. Set up your Apple developer account and connect it to Moyasar.
2. Enable the Apple Pay capability in Xcode.

ApplePay(
  config: paymentConfig,
  onPaymentResult: onPaymentResult,
  buttonType: ApplePayButtonType.buy,          // optional, default: inStore
  buttonStyle: ApplePayButtonStyle.automatic,  // optional, default: black
)

Renders Apple's native PKPaymentButton and drives the sheet through PassKit — no third-party dependency.

Visibility is handled for you:

Situation	Behavior
Not iOS, or the device can't support Apple Pay	Renders nothing
iOS 15+, no card in Wallet	Payment button — the user adds a card inside the sheet
iOS 14 and below, no card	"Set Up Apple Pay", which opens Wallet
Card available	Payment button

buttonType: plain, buy, setUp, inStore, donate, checkout, book, subscribe, reload, addMoney, topUp, order, rent, support, contribute, tip buttonStyle: white, whiteOutline, black, automatic (follows light/dark mode)

Samsung Pay

Samsung Android devices only. Add the spay_sdk_api_level meta-data to your AndroidManifest.xml — see the integration guide. The SDK bundles Samsung's official Flutter plugin, so no app-level override is needed.

SamsungPay(config: paymentConfig, onPaymentResult: onPaymentResult)

The widget hides itself when Samsung Pay isn't ready. To check explicitly in a custom flow:

final eligible = await SamsungPayEligibility.isEligible(paymentConfig);

final result = await SamsungPayEligibility.check(paymentConfig); // with diagnostics
debugPrint('${result.reason}'); // ready, notAndroid, notReady, sdkError, timeout...

Credit Card & STC Pay

Both render a full form and accept an optional locale. Localization.ar() also switches the layout to RTL; individual strings can be overridden through its named parameters.

CreditCard(config: paymentConfig, onPaymentResult: onPaymentResult)

STCPay(
  config: paymentConfig,
  onPaymentResult: onPaymentResult,
  locale: const Localization.ar(),
)

Configuration

PaymentConfig

Field	Type	Default	Description
publishableApiKey	String	required	Your publishable key.
amount	int	required	Smallest currency unit (25758 = SAR 257.58).
description	String	required	Tag for the payment.
currency	String	'SAR'	ISO currency code.
metadata	Map<String, dynamic>?	null	Searchable key/value pairs.
supportedNetworks	List<PaymentNetwork>	visa, mada, masterCard, unionPay	Also accepts amex.
applePay	ApplePayConfig?	null	Required by ApplePay.
samsungPay	SamsungPayConfig?	null	Required by SamsungPay.
creditCard	CreditCardConfig?	null	Used by CreditCard.
merchantCountryCode	String	'SA'	Used by Samsung Pay.
givenID	String?	null	Sets the payment ID — use for idempotent retries.
splits	List<PaymentSplit>?	null	Split the amount (aggregation clients only).
baseUrl	String?	null	Override the API host, e.g. https://apimig.moyasar.com.
applyCoupon	bool?	null	Set false to skip coupon application.

ApplePayConfig

Field	Type	Default	Description
merchantId	String	required	Must match Xcode and your dashboard.
label	String	required	Store name in the payment sheet.
manual	bool	required	Authorize now, capture later.
saveCard	bool	required	Tokenize for later charges.
merchantCapabilities	List<String>	["3DS", "debit", "credit"]	Must include "3DS".
supportedCountries	List<String>	["SA"]	Widening this raises fraud risk.

SamsungPayConfig

Field	Type	Default	Description
serviceId	String	required	From the Samsung merchant dashboard.
merchantName	String	required	Shown in the payment sheet.
orderNumber	String?	auto-generated	[A-Za-z0-9-], max 36 chars. Returned as samsungpay_order_id in the response metadata.
manual	bool	false	Authorize now, capture later.

CreditCardConfig

saveCard (bool, required) — tokenize after a successful payment. manual (bool, required) — authorize now, capture later.

PaymentSplit

Divide a payment among recipients, in compliance with SAMA and ZATCA. Aggregation clients only — splits on other payments are ignored. The splits must total the payment amount.

splits: [
  PaymentSplit(recipientId: 'ENTITY_ID', amount: 20000, recipientType: 'Entity'),
  PaymentSplit(recipientId: 'PLATFORM_ID', amount: 5758, recipientType: 'Platform', feeSource: true),
]

Also accepts description, reference, feeSource (default false, only one split may be the fee source), and refundable (default true).

Building your own UI

Use these when you need full control over the interface — you collect the payment data, the SDK talks to the API.

// Credit Card
final source = CardPaymentRequestSource(
  creditCardData: CardFormModel(
    name: 'John Doe',
    number: '4111111111111111',
    cvc: '123',
    month: '05',
    year: '2027',
  ),
  tokenizeCard: paymentConfig.creditCard!.saveCard,
  manualPayment: paymentConfig.creditCard!.manual,
);

// Apple Pay — appleToken is the PKPaymentToken payment data
final source = ApplePayPaymentRequestSource(
  appleToken,
  paymentConfig.applePay!.manual,
  paymentConfig.applePay!.saveCard,
);

// Samsung Pay
final source = SamsungPayPaymentRequestSource(
  samsungPayToken: token,
  manualPayment: paymentConfig.samsungPay!.manual,
);

// Then, for any source:
final result = await Moyasar.pay(
  apiKey: paymentConfig.publishableApiKey,
  paymentRequest: PaymentRequest(paymentConfig, source),
);

With a custom Credit Card UI, 3DS is your responsibility: when status is initiated, open (result.source as CardPaymentResponseSource).transactionUrl in a web view and watch for the redirect to PaymentConfig.callbackUrl.

STC Pay takes two steps — start the payment, then verify the OTP:

final result = await Moyasar.pay(
  apiKey: paymentConfig.publishableApiKey,
  paymentRequest: PaymentRequest(paymentConfig, StcRequestSource(mobile: '0512345678')),
);

final transactionUrl = (result.source as StcResponseSource).transactionUrl!;

final verified = await Moyasar.verifyOTP(
  transactionURL: transactionUrl,
  otpRequest: OtpRequestSource(otpValue: '1234'),
);

Testing

• Credit Card — test cards work against the sandbox.
• Apple Pay — use a real device; the simulator can't complete an authorization. Test amounts.
• Samsung Pay — requires a Samsung device. The example app uses flavors: flutter run --flavor default_ (Apple Pay) or --flavor spay (Samsung Pay). See example/CONFIGURATION_GUIDE.md.

Deprecations

STCPaymentComponent is deprecated and will be removed in the next major version — it's a drop-in rename to STCPay.

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Issues and pull requests are welcome at moyasar/moyasar-flutter.