How to use the braintree-web/apple-pay.create function in braintree-web

ApplePayView.prototype.initialize = function () {
  var self = this;
  var isProduction = self.client.getConfiguration().gatewayConfiguration.environment === 'production';

  self.applePayConfiguration = assign({}, self.model.merchantConfiguration.applePay);
  self.applePaySessionVersion = self.applePayConfiguration.applePaySessionVersion || DEFAULT_APPLE_PAY_SESSION_VERSION;

  delete self.applePayConfiguration.applePaySessionVersion;

  self.model.asyncDependencyStarting();

  return btApplePay.create({client: this.client}).then(function (applePayInstance) {
    var buttonDiv = self.getElementById('apple-pay-button');

    self.applePayInstance = applePayInstance;

    self.model.on('changeActivePaymentView', function (paymentViewID) {
      if (paymentViewID !== self.ID) {
        return;
      }

      global.ApplePaySession.canMakePaymentsWithActiveCard(self.applePayInstance.merchantIdentifier).then(function (canMakePayments) {
        if (!canMakePayments) {
          if (isProduction) {
            self.model.reportError('applePayActiveCardError');
          } else {
            console.error('Could not find an active card. This may be because you\'re using a production iCloud account in a sandbox Apple Pay Session. Log in to a Sandbox iCloud account to test this flow, and add a card to your wallet. For additional assistance, visit  https://help.braintreepayments.com'); // eslint-disable-line no-console
            self.model.reportError('developerError');