final MadPay pay = MadPay();

// To find out if payment is available on this device
await pay.checkPayments();

// If you need to check if user has at least one active card
await pay.checkActiveCard(
  paymentNetworks: <PaymentNetwork>[
    PaymentNetwork.visa,
    PaymentNetwork.mastercard,
  ],
);

// To pay with Apple Pay or Google Pay
await pay.processingPayment(
  google: GoogleParameters(
    gatewayName: 'Your Gateway',
    gatewayMerchantId: 'Your id',
  ),
  apple: AppleParameters(
    merchantIdentifier: 'Your id',
  ),
  currencyCode: 'USD',
  countryCode: 'US',
  paymentItems: <PaymentItem>[
    PaymentItem(name: 'T-Shirt', price: 2.98),
    PaymentItem(name: 'Trousers', price: 15.24),
  ],
  paymentNetworks: <PaymentNetwork>[
    PaymentNetwork.visa,
    PaymentNetwork.mastercard,
  ],
);