export class ApplePayViewModel extends Observable {
  constructor() {
    super()
  }

  onApplePayTap() {}
}

import { isApplePaySupported } from '@nativescript/apple-pay'

if (isApplePaySupported()) {
}

applePayBtn.once(
  ApplePayEvents.DidAuthorizePaymentHandler,
  async (args: AuthorizePaymentEventData) => {
    // 1. Send the user payment data to your payments services provider(PSP)
    // 2. Use the response from the PSP to further process your transation, or
    // close the payment sheet
  }
)

const request = {
				paymentItems,
				merchantId: <Your_Apple_Pay_Merchant_ID>, // the merchant ID for this app
				merchantCapabilities: ApplePayMerchantCapability.ThreeDS,
				countryCode: 'US',
				currencyCode: 'USD',
				shippingContactFields: [ApplePayContactFields.Name, ApplePayContactFields.PostalAddress],
				billingContactFields: [ApplePayContactFields.Name, ApplePayContactFields.PostalAddress],
				supportedNetworks: [ApplePayNetworks.Amex, ApplePayNetworks.Visa, ApplePayNetworks.Discover, ApplePayNetworks.MasterCard],
			} as ApplePayRequest;

await applePayBtn.createPaymentRequest(request).catch((err) => {
				console.log('Apple Pay Error', err);
			  });

interface ApplePayRequest {
  paymentItems: Array<ApplePayItems>
  merchantId: string // the merchant ID for this app
  merchantCapabilities: number
  countryCode: string
  currencyCode: string
  supportedNetworks: Array<ApplePayNetworks>
  billingContactFields?: Array<ApplePayContactFields>
  shippingContactFields?: Array<ApplePayContactFields>
  shippingMethods?: Array<ApplePayShippingMethods>
}

interface ApplePayItems {
  label: string
  amount: number
  type: ApplePayPaymentItemType
}

interface AuthorizePaymentEventData extends EventData {
  eventName: string
  object: any
  data?: {
    payment: PKPayment
    token: PKPaymentToken
    paymentData: ApplePayPaymentData
    billingAddress
    billingContact: PKContact
    shippingAddress
    shippingContact: PKContact
    shippingMethod: PKShippingMethod
  }
  completion: (status: ApplePayTransactionStatus) => void
}

interface AuthorizationDidFinishEventData extends EventData {
  eventName: string
  object: any
}

interface ApplePayPaymentData {
  /**
   * Encrypted payment data.
   */
  data

  /**
   * Additional version-dependent information used to decrypt and verify the payment.
   */
  header

  /**
   * Signature of the payment and header data. The signature includes the signing certificate, its intermediate CA certificate, and information about the signing algorithm.
   */
  signature

  /**
   * Version information about the payment token.
   * The token uses EC_v1 for ECC-encrypted data, and RSA_v1 for RSA-encrypted data.
   */
  version: string
}