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Change Event service

Change Event provides a detailed breakdown of what changed in your account. When reporting on a create operation, all new field values are returned; and when reporting on an update operation, both new and old values are returned, giving you a complete picture of individual changes.

Additionally, you can see which client type (such as API or web client) was used to make the change, as well as which user made the change (assuming that the information would be visible in the Change History of the web client as well).

Change Event types

The Change Event service currently tracks changes of the following resource types:

Resource type Value
Ad AD
Ad group AD_GROUP
Ad group ad AD_GROUP_AD
Ad group bid modifier AD_GROUP_BID_MODIFIER
Ad group criterion AD_GROUP_CRITERION
Campaign CAMPAIGN
Campaign budget CAMPAIGN_BUDGET
Campaign criterion CAMPAIGN_CRITERION
Ad group feed AD_GROUP_FEED
Campaign feed CAMPAIGN_FEED
Feed FEED
Feed item FEED_ITEM
Asset ASSET
Customer asset CUSTOMER_ASSET
Campaign asset CAMPAIGN_ASSET
Ad group asset AD_GROUP_ASSET

Getting changes

The list of changes must be filtered by date (the date range must be within the past 30 days).

The query must also include a LIMIT clause restricting results to at most 10,000 rows. If you're interested in more than 10,000 results, make a note of the timestamp of the last entry in the returned result set, and then set your date range on the following query to start after that time to continue where you left off.

The following example demonstrates how to fetch change events and process them, including determining who made the change, which client type they used to make the change, and the old and new values of each field in the change:

Java

private void runExample(GoogleAdsClient googleAdsClient, long customerId) {
  // Defines a GAQL query to retrieve change_event instances from the last 14 days.
  String query =
      String.format(
          "SELECT"
              + "  change_event.resource_name,"
              + "  change_event.change_date_time,"
              + "  change_event.change_resource_name,"
              + "  change_event.user_email,"
              + "  change_event.client_type,"
              + "  change_event.change_resource_type,"
              + "  change_event.old_resource,"
              + "  change_event.new_resource,"
              + "  change_event.resource_change_operation,"
              + "  change_event.changed_fields "
              + "FROM "
              + "  change_event "
              + "WHERE "
              + "  change_event.change_date_time <= '%s' "
              + "  AND change_event.change_date_time >= '%s' "
              + "ORDER BY"
              + "  change_event.change_date_time DESC "
              + "LIMIT 5",
          LocalDate.now().toString("YYYY-MM-dd"),
          LocalDate.now().minusDays(14).toString("YYYY-MM-dd"));

  // Creates a GoogleAdsServiceClient instance.
  try (GoogleAdsServiceClient client =
      googleAdsClient.getLatestVersion().createGoogleAdsServiceClient()) {
    // Issues the search query.
    SearchPagedResponse response = client.search(String.valueOf(customerId), query);

    // Processes the rows of the response.
    for (GoogleAdsRow row : response.iterateAll()) {
      ChangeEvent event = row.getChangeEvent();

      // Prints some general information about the change event.
      System.out.printf(
          "On '%s', user '%s' used interface '%s' to perform a(n) '%s' operation on a '%s' with"
              + " resource name '%s'.%n",
          event.getChangeDateTime(),
          event.getUserEmail(),
          event.getClientType(),
          event.getResourceChangeOperation(),
          event.getChangeResourceType(),
          event.getResourceName());

      // Prints some detailed information about update and create operations.
      if (event.getResourceChangeOperation() == ResourceChangeOperation.UPDATE
          || event.getResourceChangeOperation() == ResourceChangeOperation.CREATE) {
        // Retrieves the entity that was changed.
        Optional<Message> oldResource =
            getResourceByType(event.getOldResource(), event.getChangeResourceType());
        Optional<Message> newResource =
            getResourceByType(event.getNewResource(), event.getChangeResourceType());

        // Prints the old and new values for each field that was updated/created.
        for (String changedPath : row.getChangeEvent().getChangedFields().getPathsList()) {
          // Uses the FieldMasks utility to retrieve a value from a . delimited path.
          List<? extends Object> oldValue =
              oldResource.isPresent()
                  ? FieldMasks.getFieldValue(changedPath, oldResource.get())
                  : Collections.emptyList();
          List<? extends Object> newValue =
              newResource.isPresent()
                  ? FieldMasks.getFieldValue(changedPath, newResource.get())
                  : Collections.emptyList();
          // Prints different messages for UPDATE and CREATE cases.
          if (event.getResourceChangeOperation() == ResourceChangeOperation.UPDATE) {
            System.out.printf("\t %s changed from %s to %s.%n", changedPath, oldValue, newValue);
          } else if (event.getResourceChangeOperation() == ResourceChangeOperation.CREATE) {
            System.out.printf("\t %s set to %s.%n", changedPath, newValue);
          }
        }
      }
    }
  }
}
      
      

C#

public void Run(GoogleAdsClient client, long customerId)
{
    // Get the GoogleAdsService.
    GoogleAdsServiceClient googleAdsService = client.GetService(
        Services.V8.GoogleAdsService);

    // Construct a query to find details for recent changes in your account.
    // The LIMIT clause is required for the change_event resource.
    // The maximum size is 10000, but a low limit was set here for demonstrative
    // purposes.
    // The WHERE clause on change_date_time is also required. It must specify a
    // window of at most 30 days within the past 30 days.

    string startDate = DateTime.Today.Subtract(TimeSpan.FromDays(25)).ToString("yyyyMMdd");
    string endDate = DateTime.Today.Add(TimeSpan.FromDays(1)).ToString("yyyyMMdd");
    string searchQuery = $@"
        SELECT
            change_event.resource_name,
            change_event.change_date_time,
            change_event.change_resource_name,
            change_event.user_email,
            change_event.client_type,
            change_event.change_resource_type,
            change_event.old_resource,
            change_event.new_resource,
            change_event.resource_change_operation,
            change_event.changed_fields
        FROM
            change_event
        WHERE
            change_event.change_date_time >= '{startDate}' AND
            change_event.change_date_time <= '{endDate}'
        ORDER BY
            change_event.change_date_time DESC
        LIMIT 5";

    try
    {
        // Issue a search request.
        googleAdsService.SearchStream(customerId.ToString(), searchQuery,
            delegate (SearchGoogleAdsStreamResponse resp)
            {
                // Display the results.
                foreach (GoogleAdsRow googleAdsRow in resp.Results)
                {
                    ChangeEvent changeEvent = googleAdsRow.ChangeEvent;
                    ChangedResource oldResource = changeEvent.OldResource;
                    ChangedResource newResource = changeEvent.NewResource;

                    bool knownResourceType = true;
                    IMessage oldResourceEntity = null;
                    IMessage newResourceEntity = null;
                    switch (changeEvent.ChangeResourceType)
                    {
                        case ChangeEventResourceType.Ad:
                            oldResourceEntity = oldResource.Ad;
                            newResourceEntity = newResource.Ad;
                            break;

                        case ChangeEventResourceType.AdGroup:
                            oldResourceEntity = oldResource.AdGroup;
                            newResourceEntity = newResource.AdGroup;
                            break;

                        case ChangeEventResourceType.AdGroupAd:
                            oldResourceEntity = oldResource.AdGroupAd;
                            newResourceEntity = newResource.AdGroupAd;
                            break;

                        case ChangeEventResourceType.AdGroupAsset:
                            oldResourceEntity = oldResource.AdGroupAsset;
                            newResourceEntity = newResource.AdGroupAsset;
                            break;

                        case ChangeEventResourceType.AdGroupBidModifier:
                            oldResourceEntity = oldResource.AdGroupBidModifier;
                            newResourceEntity = newResource.AdGroupBidModifier;
                            break;

                        case ChangeEventResourceType.AdGroupCriterion:
                            oldResourceEntity = oldResource.AdGroupCriterion;
                            newResourceEntity = newResource.AdGroupCriterion;
                            break;

                        case ChangeEventResourceType.AdGroupFeed:
                            oldResourceEntity = oldResource.AdGroupFeed;
                            newResourceEntity = newResource.AdGroupFeed;
                            break;

                        case ChangeEventResourceType.Asset:
                            oldResourceEntity = oldResource.Asset;
                            newResourceEntity = newResource.Asset;
                            break;

                        case ChangeEventResourceType.Campaign:
                            oldResourceEntity = oldResource.Campaign;
                            newResourceEntity = newResource.Campaign;
                            break;

                        case ChangeEventResourceType.CampaignAsset:
                            oldResourceEntity = oldResource.CampaignAsset;
                            newResourceEntity = newResource.CampaignAsset;
                            break;

                        case ChangeEventResourceType.CampaignBudget:
                            oldResourceEntity = oldResource.CampaignBudget;
                            newResourceEntity = newResource.CampaignBudget;
                            break;

                        case ChangeEventResourceType.CampaignCriterion:
                            oldResourceEntity = oldResource.CampaignCriterion;
                            newResourceEntity = newResource.CampaignCriterion;
                            break;

                        case ChangeEventResourceType.CampaignFeed:
                            oldResourceEntity = oldResource.CampaignFeed;
                            newResourceEntity = newResource.CampaignFeed;
                            break;

                        case ChangeEventResourceType.CustomerAsset:
                            oldResourceEntity = oldResource.CustomerAsset;
                            newResourceEntity = newResource.CustomerAsset;
                            break;

                        case ChangeEventResourceType.Feed:
                            oldResourceEntity = oldResource.Feed;
                            newResourceEntity = newResource.Feed;
                            break;

                        case ChangeEventResourceType.FeedItem:
                            oldResourceEntity = oldResource.FeedItem;
                            newResourceEntity = newResource.FeedItem;
                            break;

                        default:
                            knownResourceType = false;
                            break;
                    }

                    if (!knownResourceType)
                    {
                        Console.WriteLine($"Unknown change_resource_type " +
                            $"'{changeEvent.ChangeResourceType}'.");
                        continue;
                    }

                    Console.WriteLine($"On #{changeEvent.ChangeDateTime}, user " +
                        $"{changeEvent.UserEmail} used interface {changeEvent.ClientType} " +
                        $"to perform a(n) '{changeEvent.ResourceChangeOperation}' " +
                        $"operation on a '{changeEvent.ChangeResourceType}' with " +
                        $"resource name {changeEvent.ChangeResourceName}.");

                    foreach (string fieldMaskPath in changeEvent.ChangedFields.Paths)
                    {
                        if (changeEvent.ResourceChangeOperation ==
                            ResourceChangeOperation.Create)
                        {
                            object newValue = FieldMasks.GetFieldValue(
                                fieldMaskPath, newResourceEntity);
                            Console.WriteLine($"\t{fieldMaskPath} set to '{newValue}'.");
                        }
                        else if (changeEvent.ResourceChangeOperation ==
                            ResourceChangeOperation.Update)
                        {
                            object oldValue = FieldMasks.GetFieldValue(fieldMaskPath,
                                oldResourceEntity);
                            object newValue = FieldMasks.GetFieldValue(fieldMaskPath,
                                newResourceEntity);

                            Console.WriteLine($"\t{fieldMaskPath} changed from " +
                                $"'{oldValue}' to '{newValue}'.");
                        }
                    }
                }
            });
    }
    catch (GoogleAdsException e)
    {
        Console.WriteLine("Failure:");
        Console.WriteLine($"Message: {e.Message}");
        Console.WriteLine($"Failure: {e.Failure}");
        Console.WriteLine($"Request ID: {e.RequestId}");
        throw;
    }
}
      
      

PHP

public static function runExample(GoogleAdsClient $googleAdsClient, int $customerId)
{
    $googleAdsServiceClient = $googleAdsClient->getGoogleAdsServiceClient();

    // Constructs a query to find details for recent changes in your account.
    // The LIMIT clause is required for the change_event resource.
    // The maximum size is 10000, but a low limit was set here for demonstrative
    // purposes.
    // The WHERE clause on change_date_time is also required. It must specify a
    // window of at most 30 days within the past 30 days.
    $query = 'SELECT change_event.resource_name, '
        . 'change_event.change_date_time, '
        . 'change_event.change_resource_name, '
        . 'change_event.user_email, '
        . 'change_event.client_type, '
        . 'change_event.change_resource_type, '
        . 'change_event.old_resource, '
        . 'change_event.new_resource, '
        . 'change_event.resource_change_operation, '
        . 'change_event.changed_fields '
        . 'FROM change_event '
        . sprintf(
            'WHERE change_event.change_date_time <= %s ',
            date_format(new DateTime('+1 day'), 'Ymd')
        ) . sprintf(
            'AND change_event.change_date_time >= %s ',
            date_format(new DateTime('-14 days'), 'Ymd')
        ) . 'ORDER BY change_event.change_date_time DESC '
        . 'LIMIT 5';
    // Issues a search request by specifying page size.
    // The page size is superfluous with the default limit set above, but it's
    // shown here since it's a good practice to use a reasonable page size when
    // you set a higher limit.
    $response =
        $googleAdsServiceClient->search($customerId, $query, ['pageSize' => self::PAGE_SIZE]);

    // Iterates over all rows in all pages and prints the requested field values for
    // the change event in each row.
    foreach ($response->iterateAllElements() as $googleAdsRow) {
        /** @var GoogleAdsRow $googleAdsRow */
        $changeEvent = $googleAdsRow->getChangeEvent();
        $oldResource = $changeEvent->getOldResource();
        $newResource = $changeEvent->getNewResource();

        $isResourceTypeKnown = true;
        $oldResourceEntity = null;
        $newResourceEntity = null;
        switch ($changeEvent->getChangeResourceType()) {
            case ChangeEventResourceType::AD:
                $oldResourceEntity = $oldResource->getAd();
                $newResourceEntity = $newResource->getAd();
                break;
            case ChangeEventResourceType::AD_GROUP:
                $oldResourceEntity = $oldResource->getAdGroup();
                $newResourceEntity = $newResource->getAdGroup();
                break;
            case ChangeEventResourceType::AD_GROUP_AD:
                $oldResourceEntity = $oldResource->getAdGroupAd();
                $newResourceEntity = $newResource->getAdGroupAd();
                break;
            case ChangeEventResourceType::AD_GROUP_ASSET:
                $oldResourceEntity = $oldResource->getAdGroupAsset();
                $newResourceEntity = $newResource->getAdGroupAsset();
                break;
            case ChangeEventResourceType::AD_GROUP_CRITERION:
                $oldResourceEntity = $oldResource->getAdGroupCriterion();
                $newResourceEntity = $newResource->getAdGroupCriterion();
                break;
            case ChangeEventResourceType::AD_GROUP_BID_MODIFIER:
                $oldResourceEntity = $oldResource->getAdGroupBidModifier();
                $newResourceEntity = $newResource->getAdGroupBidModifier();
                break;
            case ChangeEventResourceType::ASSET:
                $oldResourceEntity = $oldResource->getAsset();
                $newResourceEntity = $newResource->getAsset();
                break;
            case ChangeEventResourceType::CAMPAIGN:
                $oldResourceEntity = $oldResource->getCampaign();
                $newResourceEntity = $newResource->getCampaign();
                break;
            case ChangeEventResourceType::CAMPAIGN_ASSET:
                $oldResourceEntity = $oldResource->getCampaignAsset();
                $newResourceEntity = $newResource->getCampaignAsset();
                break;
            case ChangeEventResourceType::CAMPAIGN_BUDGET:
                $oldResourceEntity = $oldResource->getCampaignBudget();
                $newResourceEntity = $newResource->getCampaignBudget();
                break;
            case ChangeEventResourceType::CAMPAIGN_CRITERION:
                $oldResourceEntity = $oldResource->getCampaignCriterion();
                $newResourceEntity = $newResource->getCampaignCriterion();
                break;
            case ChangeEventResourceType::AD_GROUP_FEED:
                $oldResourceEntity = $oldResource->getAdGroupFeed();
                $newResourceEntity = $newResource->getAdGroupFeed();
                break;
            case ChangeEventResourceType::CAMPAIGN_FEED:
                $oldResourceEntity = $oldResource->getCampaignFeed();
                $newResourceEntity = $newResource->getCampaignFeed();
                break;
            case ChangeEventResourceType::CUSTOMER_ASSET:
                $oldResourceEntity = $oldResource->getCustomerAsset();
                $newResourceEntity = $newResource->getCustomerAsset();
                break;
            case ChangeEventResourceType::FEED:
                $oldResourceEntity = $oldResource->getFeed();
                $newResourceEntity = $newResource->getFeed();
                break;
            case ChangeEventResourceType::FEED_ITEM:
                $oldResourceEntity = $oldResource->getFeedItem();
                $newResourceEntity = $newResource->getFeedItem();
                break;
            default:
                $isResourceTypeKnown = false;
                break;
        }
        if (!$isResourceTypeKnown) {
            printf(
                "Unknown change_resource_type %s.%s",
                ChangeEventResourceType::name($changeEvent->getChangeResourceType()),
                PHP_EOL
            );
        }
        $resourceChangeOperation = $changeEvent->getResourceChangeOperation();
        printf(
            "On %s, user '%s' used interface '%s' to perform a(n) '%s' operation on a '%s' "
            . "with resource name '%s'.%s",
            $changeEvent->getChangeDateTime(),
            $changeEvent->getUserEmail(),
            ChangeClientType::name($changeEvent->getClientType()),
            ResourceChangeOperation::name($resourceChangeOperation),
            ChangeEventResourceType::name($changeEvent->getChangeResourceType()),
            $changeEvent->getChangeResourceName(),
            PHP_EOL
        );

        if (
            $resourceChangeOperation !== ResourceChangeOperation::CREATE
            && $resourceChangeOperation !== ResourceChangeOperation::UPDATE
        ) {
            continue;
        }
        foreach ($changeEvent->getChangedFields()->getPaths() as $path) {
            $newValueStr = self::convertToString(
                FieldMasks::getFieldValue($path, $newResourceEntity, true)
            );
            if ($resourceChangeOperation === ResourceChangeOperation::CREATE) {
                printf("'$path' set to '%s'.%s", $newValueStr, PHP_EOL);
            } elseif ($resourceChangeOperation === ResourceChangeOperation::UPDATE) {
                printf(
                    "'$path' changed from '%s' to '%s'.%s",
                    self::convertToString(
                        FieldMasks::getFieldValue($path, $oldResourceEntity, true)
                    ),
                    $newValueStr,
                    PHP_EOL
                );
            }
        }
    }
}

/**
 * Converts the specified value to string.
 *
 * @param mixed $value the value to be converted to string
 * @return string the value in string
 */
private static function convertToString($value)
{
    if (is_null($value)) {
        return 'no value';
    }
    if (gettype($value) === 'boolean') {
        return $value ? 'true' : 'false';
    } elseif (gettype($value) === 'object' && get_class($value) === RepeatedField::class) {
        return json_encode(iterator_to_array($value->getIterator()));
    } else {
        return strval($value);
    }
}
      
      

Python

def main(client, customer_id):
    """Gets specific details about the most recent changes in the given account.

    Args:
      client: The Google Ads client.
      customer_id: The Google Ads customer ID.
    """
    googleads_service = client.get_service("GoogleAdsService")

    # Construct a query to find details for recent changes in your account.
    # The LIMIT clause is required for the change_event resource.
    # The maximum size is 10000, but a low limit was set here for demonstrative
    # purposes. For more information see:
    # https://developers.google.com/google-ads/api/docs/change-event#getting_changes
    # The WHERE clause on change_date_time is also required. It must specify a
    # window within the past 30 days.
    tomorrow = (datetime.now() + timedelta(1)).strftime("%Y-%m-%d")
    two_weeks_ago = (datetime.now() + timedelta(-14)).strftime("%Y-%m-%d")
    query = f"""
        SELECT
          change_event.resource_name,
          change_event.change_date_time,
          change_event.change_resource_name,
          change_event.user_email,
          change_event.client_type,
          change_event.change_resource_type,
          change_event.old_resource,
          change_event.new_resource,
          change_event.resource_change_operation,
          change_event.changed_fields
        FROM change_event
        WHERE change_event.change_date_time <= '{tomorrow}'
        AND change_event.change_date_time >= '{two_weeks_ago}'
        ORDER BY change_event.change_date_time DESC
        LIMIT 5"""

    search_request = client.get_type("SearchGoogleAdsRequest")
    search_request.customer_id = customer_id
    search_request.query = query
    search_request.page_size = _DEFAULT_PAGE_SIZE

    results = googleads_service.search(request=search_request)

    for row in results:
        event = row.change_event
        resource_type = event.change_resource_type.name
        if resource_type == "AD":
            old_resource = event.old_resource.ad
            new_resource = event.new_resource.ad
        elif resource_type == "AD_GROUP":
            old_resource = event.old_resource.ad_group
            new_resource = event.new_resource.ad_group
        elif resource_type == "AD_GROUP_AD":
            old_resource = event.old_resource.ad_group_ad
            new_resource = event.new_resource.ad_group_ad
        elif resource_type == "AD_GROUP_ASSET":
            old_resource = event.old_resource.ad_group_asset
            new_resource = event.new_resource.ad_group_asset
        elif resource_type == "AD_GROUP_CRITERION":
            old_resource = event.old_resource.ad_group_criterion
            new_resource = event.new_resource.ad_group_criterion
        elif resource_type == "AD_GROUP_BID_MODIFIER":
            old_resource = event.old_resource.ad_group_bid_modifier
            new_resource = event.new_resource.ad_group_bid_modifier
        elif resource_type == "AD_GROUP_FEED":
            old_resource = event.old_resource.ad_group_feed
            new_resource = event.new_resource.ad_group_feed
        elif resource_type == "ASSET":
            old_resource = event.old_resource.asset
            new_resource = event.new_resource.asset
        elif resource_type == "CAMPAIGN":
            old_resource = event.old_resource.campaign
            new_resource = event.new_resource.campaign
        elif resource_type == "CAMPAIGN_ASSET":
            old_resource = event.old_resource.campaign_asset
            new_resource = event.new_resource.campaign_asset
        elif resource_type == "CAMPAIGN_BUDGET":
            old_resource = event.old_resource.campaign_budget
            new_resource = event.new_resource.campaign_budget
        elif resource_type == "CAMPAIGN_CRITERION":
            old_resource = event.old_resource.campaign_criterion
            new_resource = event.new_resource.campaign_criterion
        elif resource_type == "CAMPAIGN_FEED":
            old_resource = event.old_resource.campaign_feed
            new_resource = event.new_resource.campaign_feed
        elif resource_type == "CUSTOMER_ASSET":
            old_resource = event.old_resource.customer_asset
            new_resource = event.new_resource.customer_asset
        elif resource_type == "FEED":
            old_resource = event.old_resource.feed
            new_resource = event.new_resource.feed
        elif resource_type == "FEED_ITEM":
            old_resource = event.old_resource.feed_item
            new_resource = event.new_resource.feed_item
        else:
            print(
                "Unknown change_resource_type: '{event.change_resource_type}'"
            )
            # If the resource type is unrecognized then we continue to
            # the next row.
            continue

        print(
            f"On {event.change_date_time}, user {event.user_email} "
            f"used interface {event.client_type.name} to perform a(n) "
            f"{event.resource_change_operation.name} operation on a "
            f"{event.change_resource_type.name} with resource name "
            f"'{event.change_resource_name}'"
        )

        operation_type = event.resource_change_operation.name

        if operation_type in ("UPDATE", "CREATE"):
            for changed_field in event.changed_fields.paths:
                # Change field name from "type" to "type_" so that it doesn't
                # raise an exception when accessed on the protobuf object, see:
                # https://developers.google.com/google-ads/api/docs/client-libs/python/library-version-10#field_names_that_are_reserved_words
                if changed_field == "type":
                    changed_field = "type_"

                new_value = get_nested_attr(new_resource, changed_field)
                # If the field value is an Enum get the human readable name
                # so that it is printed instead of the field ID integer.
                if isinstance(type(new_value), ProtoEnumMeta):
                    new_value = new_value.name

                if operation_type == "CREATE":
                    print(f"\t{changed_field} set to {new_value}")
                else:
                    old_value = get_nested_attr(old_resource, changed_field)
                    # If the field value is an Enum get the human readable name
                    # so that it is printed instead of the field ID integer.
                    if isinstance(type(old_value), ProtoEnumMeta):
                        old_value = old_value.name

                    print(
                        f"\t{changed_field} changed from {old_value} to {new_value}"
                    )
      
      

Ruby

def get_change_details(customer_id)
  # GoogleAdsClient will read a config file from
  # ENV['HOME']/google_ads_config.rb when called without parameters
  client = Google::Ads::GoogleAds::GoogleAdsClient.new

  # Construct a query to find details for recent changes in your account.
  # The LIMIT clause is required for the change_event resource.
  # The maximum size is 10000, but a low limit was set here for demonstrative
  # purposes.
  # The WHERE clause on change_date_time is also required. It must specify a
  # window of at most 30 days within the past 30 days.
  query = <<~QUERY
    SELECT
      change_event.resource_name,
      change_event.change_date_time,
      change_event.change_resource_name,
      change_event.user_email,
      change_event.client_type,
      change_event.change_resource_type,
      change_event.old_resource,
      change_event.new_resource,
      change_event.resource_change_operation,
      change_event.changed_fields
    FROM
      change_event
    WHERE
      change_event.change_date_time <= '#{(Date.today + 1).to_s}'
      AND change_event.change_date_time >= '#{(Date.today - 14).to_s}'
    ORDER BY
      change_event.change_date_time DESC
    LIMIT 5
  QUERY

  # Execute the query to fetch results from the API.
  response = client.service.google_ads.search(
    customer_id: customer_id,
    query: query,
    # The page size is superfluous with the default limit set above, but it's
    # shown here since it's a good practice to use a reasonable page size when
    # you set a higher limit.
    page_size: PAGE_SIZE
  )

  # Process the results and output changes.
  response.each do |row|
    event = row.change_event
    old_resource, new_resource = case event.change_resource_type
    when :AD
      [event.old_resource.ad, event.new_resource.ad]
    when :AD_GROUP
      [event.old_resource.ad_group, event.new_resource.ad_group]
    when :AD_GROUP_AD
      [event.old_resource.ad_group_ad, event.new_resource.ad_group_ad]
    when :AD_GROUP_ASSET
      [event.old_resource.ad_group_asset, event.new_resource.ad_group_asset]
    when :AD_GROUP_CRITERION
      [event.old_resource.ad_group_criterion, event.new_resource.ad_group_criterion]
    when :AD_GROUP_BID_MODIFIER
      [event.old_resource.ad_group_bid_modifier, event.new_resource.ad_group_bid_modifier]
    when :CAMPAIGN
      [event.old_resource.campaign, event.new_resource.campaign]
    when :CAMPAIGN_ASSET
      [event.old_resource.campaign_asset, event.new_resource.campaign_asset]
    when :CAMPAIGN_BUDGET
      [event.old_resource.campaign_budget, event.new_resource.campaign_budget]
    when :CAMPAIGN_CRITERION
      [event.old_resource.campaign_criterion, event.new_resource.campaign_criterion]
    when :AD_GROUP_FEED
      [event.old_resource.ad_group_feed, event.new_resource.ad_group_feed]
    when :ASSET
      [event.old_resource.asset, event.new_resource.asset]
    when :CAMPAIGN_FEED
      [event.old_resource.campaign_feed, event.new_resource.campaign_feed]
    when :CUSTOMER_ASSET
      [event.old_resource.customer_asset, event.new_resource.customer_asset]
    when :FEED
      [event.old_resource.feed, event.new_resource.feed]
    when :FEED_ITEM
      [event.old_resource.feed_item, event.new_resource.feed_item]
    else
      puts "Unknown change_resource_type #{event.change_resource_type}."
      next
    end
    puts "On #{event.change_date_time}, user #{event.user_email} used interface " \
      "#{event.client_type} to perform a(n) #{event.resource_change_operation} " \
      "operation on a #{event.change_resource_type} with resource name " \
      "#{event.change_resource_name}."
    if [:UPDATE, :CREATE].include? event.resource_change_operation
      event.changed_fields.paths.each do |changed_field|
        new_value = get_value_from_path(changed_field, new_resource)
        if :CREATE == event.resource_change_operation
          puts "\t#{changed_field} set to '#{new_value}'."
        else
          old_value = get_value_from_path(changed_field, old_resource)
          puts "\t#{changed_field} changed from '#{old_value}' to '#{new_value}'."
        end
      end
    end
  end
end

# Given the string value of a path from the response, look up the value of the
# field located at that path on the given object.
def get_value_from_path(path, object)
  path.split(".").inject(object) {|obj, key| obj.send(key)}
end
      
      

Perl

sub get_change_details {
  my ($api_client, $customer_id) = @_;

  # Construct a query to find details for recent changes in your account.
  # The LIMIT clause is required for the change_event resource.
  # The maximum size is 10000, but a low limit was set here for demonstrative
  # purposes.
  # The WHERE clause on change_date_time is also required. It must specify a
  # window of at most 30 days within the past 30 days.
  my $search_query =
    "SELECT change_event.resource_name, change_event.change_date_time, " .
    "change_event.change_resource_name, change_event.user_email, " .
    "change_event.client_type, change_event.change_resource_type, " .
    "change_event.old_resource, change_event.new_resource, " .
    "change_event.resource_change_operation, change_event.changed_fields " .
    "FROM change_event " .
    "WHERE change_event.change_date_time DURING LAST_14_DAYS " .
    "ORDER BY change_event.change_date_time DESC LIMIT 5";

  # Create a search Google Ads request that will retrieve all change events using
  # pages of the specified page size.
  my $search_request =
    Google::Ads::GoogleAds::V8::Services::GoogleAdsService::SearchGoogleAdsRequest
    ->new({
      customerId => $customer_id,
      query      => $search_query,
      # The page size is superfluous with the default limit set above, but it's
      # shown here since it's a good practice to use a reasonable page size
      # when you set a higher limit.
      pageSize => PAGE_SIZE
    });

  # Get the GoogleAdsService.
  my $google_ads_service = $api_client->GoogleAdsService();

  my $iterator = Google::Ads::GoogleAds::Utils::SearchGoogleAdsIterator->new({
    service => $google_ads_service,
    request => $search_request
  });

  # Iterate over all rows in all pages and print the requested field values for
  # the change event in each row.
  while ($iterator->has_next) {
    my $google_ads_row = $iterator->next;

    my $change_event = $google_ads_row->{changeEvent};
    printf "On %s, user %s used interface %s to perform a(n) %s operation " .
      "on a %s with resource name '%s'.\n", $change_event->{changeDateTime},
      $change_event->{userEmail}, $change_event->{clientType},
      $change_event->{resourceChangeOperation},
      $change_event->{changeResourceType}, $change_event->{changeResourceName};

    if (grep /$change_event->{resourceChangeOperation}/, (CREATE, UPDATE)) {
      my ($old_resource, $new_resource) =
        _get_changed_resources_for_resource_type($change_event);

      foreach my $changed_field (split /,/, $change_event->{changedFields}) {
        my $new_value = get_field_value($new_resource, $changed_field) || "";
        if ($change_event->{resourceChangeOperation} eq CREATE) {
          print "\t$changed_field set to '$new_value'.\n";
        } else {
          my $old_value = get_field_value($old_resource, $changed_field) || "";
          print "\t$changed_field changed from '$old_value' to '$new_value'.\n";
        }
      }
    }
  }

  return 1;
}

# This method returns the old resource and new resource based on the change
# resource type of a change event.
sub _get_changed_resources_for_resource_type {
  my $change_event  = shift;
  my $resource_type = $change_event->{changeResourceType};
  if ($resource_type eq AD) {
    return $change_event->{oldResource}{ad}, $change_event->{newResource}{ad};
  } elsif ($resource_type eq AD_GROUP) {
    return $change_event->{oldResource}{adGroup},
      $change_event->{newResource}{adGroup};
  } elsif ($resource_type eq AD_GROUP_AD) {
    return $change_event->{oldResource}{adGroupAd},
      $change_event->{newResource}{adGroupAd};
  } elsif ($resource_type eq AD_GROUP_ASSET) {
    return $change_event->{oldResource}{adGroupAsset},
      $change_event->{newResource}{adGroupAsset};
  } elsif ($resource_type eq AD_GROUP_CRITERION) {
    return $change_event->{oldResource}{adGroupCriterion},
      $change_event->{newResource}{adGroupCriterion};
  } elsif ($resource_type eq AD_GROUP_BID_MODIFIER) {
    return $change_event->{oldResource}{adGroupBidModifier},
      $change_event->{newResource}{adGroupBidModifier};
  } elsif ($resource_type eq AD_GROUP_FEED) {
    return $change_event->{oldResource}{adGroupFeed},
      $change_event->{newResource}{adGroupFeed};
  } elsif ($resource_type eq ASSET) {
    return $change_event->{oldResource}{asset},
      $change_event->{newResource}{asset};
  } elsif ($resource_type eq CAMPAIGN) {
    return $change_event->{oldResource}{campaign},
      $change_event->{newResource}{campaign};
  } elsif ($resource_type eq CAMPAIGN_ASSET) {
    return $change_event->{oldResource}{campaignAsset},
      $change_event->{newResource}{campaignAsset};
  } elsif ($resource_type eq CAMPAIGN_BUDGET) {
    return $change_event->{oldResource}{campaignBudget},
      $change_event->{newResource}{campaignBudget};
  } elsif ($resource_type eq CAMPAIGN_CRITERION) {
    return $change_event->{oldResource}{campaignCriterion},
      $change_event->{newResource}{campaignCriterion};
  } elsif ($resource_type eq CAMPAIGN_FEED) {
    return $change_event->{oldResource}{campaignFeed},
      $change_event->{newResource}{campaignFeed};
  } elsif ($resource_type eq CUSTOMER_ASSET) {
    return $change_event->{oldResource}{customerAsset},
      $change_event->{newResource}{customerAsset};
  } elsif ($resource_type eq FEED) {
    return $change_event->{oldResource}{feed},
      $change_event->{newResource}{feed};
  } elsif ($resource_type eq FEED_ITEM) {
    return $change_event->{oldResource}{feedItem},
      $change_event->{newResource}{feedItem};
  } else {
    print "Unknown change_resource_type $resource_type.\n";
  }
}
      
      

Limitations

A change event may not include every row from the Change History in the web client. For a similar view to Change History, use the change status resource instead.

The change event resource is intended to drill down into the specifics of an individual change. You can retrieve data such as specific field values that have changed, who made the change, and whick client type was used to make the change. However, not all changes to your account will have a corresponding change event entry.

Some key client types that do record their changes for use with change event include:

  • Google Ads API
  • Google Ads Editor
  • Google Ads web client