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function createCallout() {
  // For full details on creating a new callout extension, see:
  // https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_calloutbuilder
  const newCallout = AdsApp.extensions().newCalloutBuilder()
      // Replace the values below with your text, and mobile preferred
      .withText('Free Shipping')                // required
      .withMobilePreferred(true)                // optional
      .build()
      .getResult();

  // Add callout to a campaign
  const campaignIterator = AdsApp.campaigns()
      .withCondition('campaign.name = "INSERT_CAMPAIGN_NAME_HERE"')
      .get();
  if (campaignIterator.hasNext()) {
    const campaign = campaignIterator.next();
    campaign.addCallout(newCallout);
  }

  // Add callout to an ad group
  const adGroupIterator = AdsApp.adGroups()
      .withCondition('campaign.name = "INSERT_CAMPAIGN_NAME_HERE"')
      .withCondition('ad_group.name = "INSERT_AD_GROUP_NAME_HERE"')
      .get();
  if (adGroupIterator.hasNext()) {
    const adGroup = adGroupIterator.next();
    adGroup.addCallout(newCallout);
  }

  // Add callout to an account
  const account = AdsApp.currentAccount();
  account.addCallout(newCallout);
}

function logCalloutDetails() {
  // Get a campaign.
  const campaignIterator = AdsApp.campaigns()
      .withCondition('campaign.name = "INSERT_CAMPAIGN_NAME_HERE"')
      .get();
  if (!campaignIterator.hasNext()) {
    throw new Error('Campaign not found.');
  }
  const campaign = campaignIterator.next();

  // Retrieve the campaign's callouts. Retrieving an ad group's and
  // account's calloutss is similar.
  const calloutIterator = campaign.extensions().callouts().get();
  for (const callout of calloutIterator) {
    // You can also request reports for pre-defined date ranges. See
    // https://developers.google.com/adwords/api/docs/guides/awql,
    // DateRangeLiteral section for possible values.
    const stats = callout.getStatsFor('LAST_MONTH');

    console.log(`Callout text : ${ callout.getText() }`);
    console.log(`mobile preferred : ${ callout.isMobilePreferred() }`);
    console.log(`clicks : ${ stats.getClicks() }`);
    console.log(`impressions : ${ stats.getImpressions() }`);
    console.log('=======');
  }

  console.log(`${calloutIterator.totalNumEntities()} callouts in the campaign`);
}

function setCalloutSchedule() {
  // Get a campaign.
  const campaignIterator = AdsApp.campaigns()
      .withCondition('campaign.name = "INSERT_CAMPAIGN_NAME_HERE"')
      .get();
  if (!campaignIterator.hasNext()) {
    throw new Error('Campaign not found.');
  }
  const campaign = campaignIterator.next();

  // Retrieve the campaign's callouts. Retrieving an ad group's and
  // account's saitelinks is similar.
  const calloutIterator = campaign.extensions().callouts().get();

  for (const callout of calloutIterator) {
    if (callout.getText() == 'Free Shipping') {
      // Set callout extension schedule to run only on Mondays and Tuesdays,
      // 9 AM to 6 PM. You can follow a similar approach to set schedules for
      // other ad extension types.
      const monday = {
          dayOfWeek: 'MONDAY',
          startHour: 9,
          startMinute: 0,
          endHour: 18,
          endMinute: 0
      };

      const tuesday = {
          dayOfWeek: 'TUESDAY',
          startHour: 9,
          startMinute: 0,
          endHour: 18,
          endMinute: 0
      };

      callout.setSchedules([monday, tuesday]);

      return;
    }
  }
}