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Tracking API

To provide recommendations, a tracking process needs to collect user behavior on the customer's site. The most popular user events are:

  • Click - When a user opens a detail page.
  • Buy/Consume - When a user buys an item or consumes content
  • Rate - When a user likes, comments or rates an item
  • Login - When a user logs in on a website
  • Clickrecommended - When a user clicks a recommendation

For a complete list of events, see Event types in the user documentation. Depending on the event type, some additional parameters, such as item price or user rating, must be provided.

Importing historical user data can help you reduce the delay in delivery of high quality recommendations. For more information, see Importing historical user tracking data.

Apart from the tracking API, you can add tracking to the website by integrating a JavaScript library. For more information, see Tracking with yct.js.


You can use the tracking API both in eCommerce and content publishing scenarios. eCommerce mostly uses the term "product", whereas the Publisher domain widely uses the terms "content", "article", "images" or "videos". Therefore, a generic term "item" is used instead to cover all the above types. For further segmentation the term "item type" is used, which, in combination with the item ID itself, defines a domain specific object.

For example, an electronic product could be defined by item type "1" and item id "3298", while a textile product could be defined by item type "2" and item id "3298".


Usually only one item type is sufficient in the eCommerce business as each product available in an eCommerce shop has a unique identifier.

Domain Item ID Item Type
Content publishing Article ID of an article
Content publishing Video ID of a video
Content publishing Photo Gallery ID of a photo gallery

Assuming the numbering of content is independent and the same item ID is used for two items of different item types, it is impossible to tell the difference if there is no segmentation by item types.

If an article, a video and a photo gallery have the same item ID, use different item types to separate the items that are tracked. For example:

  • item type "1" and itemid "29712" -> article
  • item type "2" and itemid "29712" -> video
  • item type "3" and itemid "29712" -> photo gallery


Even if item IDs cannot overlap in a customer's system, Ibexa recommends using different item types to provide independent tracking and cross-item type recommendations, such as, for example, "Users who read this article also watched these videos" or "Users who liked this gallery also read these articles".


User identifier

High quality recommendations can only be delivered if the underlying data is correct and consistent. For consistent tracking it is crucial to choose and use a consistent identifier for a user. A user usually visits a website anonymously. Therefore, their identifier is either a first-party cookie or a session ID provided by the website. If there is no existing user ID handling that can be re-used, it is recommended that you use your own cookie and set the expiry date to at least 90 days from the last usage. If there is a login mechanism, the user is usually tracked with a temporary identifier before the login. Immediately after a successful login process a Login event must be sent. At this point a pseudonymous user ID, for example, a system's internal registration id, must be used. After logout, the anonymous user ID can be used again.


The user identifier is required in tracking requests, otherwise it is discarded from the tracking servers.

If a browser has JavaScript or cookies disabled, make sure that you put some "dummy" value as identifier in the tracking request to avoid losing tracking information. Even if the event is not user-specific, it is still useful for popularity models.

The recommendation engine internally creates a hash of every user ID. The original ID is not saved. It is still possible that the original ID appears in the log files for the debugging purposes but log files are purged regularly. The user ID is case sensitive.

Item identifiers

Persons responsible for the sales policy in place in your organization must decide what should be presented as recommendations on the website. In the eCommerce business you mostly have the possibility to track items based on:

  • Stock Keeping Unit (SKU) or
  • Universal Product Code (UPC)

The exact identifiers that are tracked are also recommended ("what-you-track-is-what-you-get"). By default, it is not possible to track SKUs but recommend UPCs. The following use case is typical for eCommerce business:

Customer A implements the recommendation engine and decides to use the SKU as item identifiers and recommendable items. End users who browse through the shop probably get recommendations of the same item that is currently displayed but in a different size and/or color, a so-called "variant". The recommendation engine does not recognize relations between items, therefore, every single SKU is used to calculate similarities between them. In the case of bestsellers, this could lead to the appearance of a shirt in size L on position 2 and the same shirt in size M on position 4.

Customer B decides to use the UPC as item identifiers. This results in recommendations that do not contain variations of the currently shown item. Therefore, the detail page of shirt X does not contain a recommendation for the same shirt in a different size. And the same shirt does not show up twice on a list of bestseller recommendations.

If the size of an item or the color is selectable on a detail page of an item, you may prefer to use the UPC. If recommendations of the same item in different sizes or colors are desired, you should use the SKU as item identifiers.

Remember to use the same identifier in all interactions between your site and the recommendation engine, for example, when a user buys an item, clicks a recommendation or displays a product page.

Request parameter categorypath

Category paths are logical tree structures that lead to items and are used for recommendation filtering. For example, "recommend only items from the same category".

During recommendation requests, the category path must always be provided. The category path is a forward slash-separated list of categories from the root, for example, %2FFoto%2FCameras%2FCompact%2FCanon. The initial slash (if present) is ignored. Like all other parameters, the category path must be URL-encoded and cannot contain backslashes.

The "categorypath" parameter offers the possibility to provide category-based recommendations without an explicit export of the structure of a customer's website. If enabled by Ibexa, it is used for on-the-fly updating of item categories. If an item is moved to another category, it is handled as present in both categories until the old category ages out or is forcibly deleted. Multiple category locations of an item (multi-homing) are therefore possible.

Category paths

When you import your own item metadata by using the recommendation engine import interface, you might choose to not provide the category path in the Click event. Category path is required by default, contact Ibexa to change the default configuration.

Tracking events


Events are forwarded to the recommendation engine with HTTP or HTTPS requests (or RESTful-Requests. Both GET and POST methods are allowed for the event tracking. Make sure that all embedded and query string parameters are URL encoded and do not use a backslash [encoded as %5C].

Event parameters

For a list of embedded parameters that each of the events may use, see the following table.

Name Description Values
customerid A customer ID (for example "00000"). Can be used to identify a website in installations that hosts multiple SiteAccesses. alphanumeric
userid A user's ID on the website of the customer. It could be an internal customer code, a session code or a cookie for anonymous users. URL-encoded alphanumeric
itemtypeid Item type ID. 1 to 2147483647
itemid A unique ID of the item the user has clicked.
String-based identifiers are also supported as item IDs to track content on a website, but it is discouraged due to fraud and security issues. If you are unable to provide numeric identifiers for the tracking process, contact Ibexa for further information and implementation notes.
1 to 2147483647
sourceuserid User identifier valid up to now(usually some anonymous session ID) URL-encoded alphanumeric
targetuserid User identifier valid from now on (usually an account ID or login name) URL-encoded alphanumeric

Click event

When the end user opens an item/article detail, a Click events is sent. The Click event often provides additional information about the category structure of the website.


User IDs are not stored in the database. They are irreversibly anonymized before saving to disk or building the recommendation model.

The URL to track user clicks has the following format:


All embedded parameters are required for the request. For a detailed description of embedded parameters, see event parameters. Some optional request parameters can be set over query string parameters (GET parameters).


Name Description Values
categorypath The forward slash-separated path of categories of the item. Like all other parameters it must be URL-encoded, for example %2FCameras%26Foto%2FCompact%20Cameras%2FCanon.
For use cases, see Category path filters in the user documentation.
URL-encoded string.
Initial and trailing slashes are ignored: "/Cameras/" is the same as "Cameras".

Consume event

eCommerce vs. content publishing

The Consume event is important for content publishing websites. For eCommerce stores, this event is not required but can be used in custom implementations.

The event is sent when the end user stays on the page for a predefined period of time. It is then assumed that the user consumed the item (read an article or watched a video).

The URL has the following format:


For a detailed description of embedded parameters, see event parameters. The following table lists the request parameters:

Name Description Values
percentage Informs how much of an item was consumed, for example, that an article was read only in 20%, a movie was watched in 90% or someone finished ¾ of all levels of a game. 0-100

The logic for calculating the percentage is defined by the implementation. For articles, this could be by scrolling down, for a movie/video based on the consumption part. You must decide what 100% consumption means. For example, a movie contains end titles that are almost never consumed. Therefore, they should not be part of the percentage calculation.

The simplest implementation for articles is a JavaScript timer, which sends this event after a predefined time has elapsed (and the user did not leave the page). The timespan after that the event is triggered should be dependent on the content, for example, it could be 30 seconds for a small newspaper article or a timespan calculated by the amount of words.

Incremental tracking of consume events

Consume events for a user can be sent incrementally as the recommender uses only the highest percentage rate. For example, if a user watches a movie, the site could send Consume events in 10% steps to avoid losing tracking information when the browser window is forcibly closed.

Buy event

As the name suggests, this event is used when an end user buys an item. It must be sent to the event tracker at the end of a successful check-out process to ensure that no further action of the user can result in an abort.

The URL has the following format:


For a detailed description of embedded parameters, see event parameters. In addition to the fact that an item is bought, this event should provide information about the product price and quantity.

Name Description Values
quantity The number of products a user has bought. Default value is "1". You can send n events instead of setting this parameter to n. This parameter is optional. integer (default is "1")
fullprice A price for a single product. It contains the price in decimal format plus the currency ISO 4217 code. If the price has a decimal part, the point must be used. There can be no space between price and currency. This parameter is optional. currency, for example "12.45EUR" or "456JPY"

For example, if a user bought 4 pens for 10 Euros, fullprice can be set to "2.50EUR" and quantity can be set to 4.

The Buy event is only relevant if the user is charged per product, like in a classic shop. If products are sold on a subscription basis, or the web presence is ad-sponsored, this event type is not applicable.

Prices in a Buy event

Every Buy event can contain a price. If the price is set, it is stored with the event and used for calculating the revenue for statistics. The price must be a price the user paid for the item, including all taxes and discounts.

If product price filtering is activated, the information provided over the product import is used. For more information, see Content API.

The currency is stored with the price and normalized only when statistic information is requested. It is often a good choice to select a base currency and convert prices before sending the buy event. The price attached to a buy event never overwrites the price which was defined in an item import.

Login event

Recommendations rely on the fact that user actions can be correlated over a longer period of time. Moreover, recommendations similar to "users who viewed this product ultimately bought it" require correlating Click events with subsequent Buy events. In general, users tend to browse a site anonymously and add products to their shopping cart. Up to this point, a user is identified by a visit-scoped variable (for example, a session ID or a first party cookie). During the check-out of the shopping cart, a user probably logs in to an existing account. As a result, the user identifier changes from an anonymous visit-scoped ID (sourceuserid) to a pseudonymous, persistent account ID (targetuserid). You should correlate both IDs to correlate the Buy events (account ID) with the preceding Click events (visit-scoped ID). The Login event serves exactly this purpose.

The format of the URL is:


For a detailed description of embedded parameters, see event parameters.

Basket event

The Basket event can be used to add products to a user's shopping cart. This event is especially useful if anonymized checkout is allowed or no recurring user identification is possible. By using the shopping cart products as input for getting recommendations, problems with an empty profile or no buy history for the user can be solved. The more valuable Basket events instead of recent user clicks can be used to provide personalized recommendations. It also happens quite often that users "store" products on their shopping wishlist and plan to buy them later. With the help of this information, personalized shopping cart-based recommendations can be provided in the whole shop.


For a detailed description of embedded parameters, see event parameters. There are no query string parameters for this event.

Deletefrombasket event

The Deletefrombasket is issued when the end user removes items from their shopping cart. It could signify that the user has lost interest in the product. Based on this information, recommendations presented by the store can be more accurate.


For a detailed description of embedded parameters, see event parameters. There are no query string parameters for this event.

Rate event

Publishers, media or shops often allow commenting/rating products, articles or movies. If a user comments on an item, it indicates a special interest in this topic that has to be treated separately.

The format of the URL is:


For a detailed description of embedded parameters, see event parameters.

Rate event can also be used for explicit ratings like a five-star rating for hotels. A predefined rating can be submitted when the user comments on an item.

Name Description Values
rating The rating a user gives an item. The rating value is normalized during the calculation of rate-based recommendations. Therefore, there is no need to use the full scale of 0-100 but it needs to be consistent. integer from 0 to 100

Blacklist event

If a website offers a link or button that allows feedback similar to "do not recommend this product to me anymore", a user could express that they have bought it already in another shop.

The format of the URL is:


For a detailed description of embedded parameters, see event parameters. There are no query string parameters for this event.

Tracking events based on recommendations

Tracking events based on integrated recommendations are the only way to measure the accuracy and effectiveness of recommendations. Both recommendation response and trigger message include requests to generate these events. Events of this type inform the Personalization server about the recommendations that were shown to the user and which of those recommendations were clicked. Otherwise, it would be impossible to calculate reliable statistics that could be checked against the customer's KPIs.

A recommendation response includes requests to generate a Rendered and Clickrecommended event. The first one is executed when a recommendation is shown to the user. The second is called when a recommendation is clicked or otherwise accepted.
Sending Rendered events causes as many requests as recommendations to be displayed, a Clickrecommended event is usually sent only once (when a user clicks on a specific recommendation item).

Example of a recommendation response:

"recommendationItems": [
      "relevance": 23,
      "itemType": 1,
      "itemId": 100175717,
      "origin": {
        "itemIds" : [10, 11],
        "itemType" : 1,
        "source" : "REQUEST" 
      "category" : "Men/Shirts",
      "links" : {
         "clickRecommended" : "//",
         "rendered" : "//"
Field name Description
itemIds Items that the recommendations are based on (context or user history items), multiple values are possible.
source Event that initiated the response: REQUEST (parameter "contextitems") or CLICK, CONSUME, BUY, BASKET, RATE (user history).
category A recommended item category. Provided only if category suggestion is requested.
links Requests for events that are executed when the end user displays or clicks a recommendation.

See Recommendation API for more details.

A trigger message includes requests for a Triggeropened and Clicktriggered event. The first is executed once, when the end user opens a trigger message (for example, embedded into a newsletter). The second is called each time the user follows a link to see the recommended item. Both requests provide the triggername parameter, which passes a unique alphanumerical identifier of the trigger that initiated the message.

Example of a trigger message:

   "userExternalId":"[email protected]",
            "ses_name":"Minimalista Coffee Table",
            "ses_image":["img_1", "img_2"]

For more information, see Sending messages with recommendations.

Rendered event

This event is sent when the website uses the recommendation provided by the recommendation engine and renders it on the webpage. In combination with a predefined threshold, it allows the recommender engine to exclude this item from future results and avoid recommending the same item to the same user multiple times during a session.

The URL for a Rendered event has the following format:


For a detailed description of embedded parameters, see event parameters.

It is common that recommendations are rendered as a block with multiple items. To save traffic and speed up the process, you can bundle multiple recommendations in one request. Several item IDs must be comma-separated.

Clickrecommended event

When the end users clicks a recommendation, the following event is sent to gather statistics related to the acceptance of recommendations.

The URL has the following format:


For a detailed description of embedded parameters, see event parameters. The request parameters are:

Name Description Values
scenario Name of the scenario, where recommendations originated from. This parameter is required. URL-encoded alphanumeric

The scenario parameter identifies the originating scenario to gain detailed statistics about the scenario that motivated the user to click on a recommendation. This information comes with the recommendation from the recommendation controller.

The event is used for providing statistics about how often recommendations of the configured recommendation scenario were accepted or considered as useful by users.

Triggeropened event

The Triggeropened event is sent when the end user opens a trigger message, for example, by opening an email message with recommendations.

The URL has the following format:


For a detailed description of embedded parameters, see event parameters. The request parameter is:

Name Description Values
triggername Identifier of the trigger that the message originates from. This parameter is required. URL-encoded alphanumeric

The event is used for providing statistics about how often trigger messages are considered valuable by the users.

Clicktriggered event

The Clicktriggered event is sent when the end user clicks the link delivered in a trigger message to see the recommended item.

The URL has the following format:


For a detailed description of embedded parameters, see event parameters. The request parameter is:

Name Description Values
triggername Identifier of the trigger that the recommendation originates from. This parameter is required. URL-encoded alphanumeric

The event is used for providing statistics about how often a specific recommendation from the trigger message is considered useful by the user.

Tracking event examples

Below are examples for the translation of user actions on a website into tracking requests.

User "Js79009234YU7" navigates to an item 123 of type 1, located under Shoes/Children:


Products 128, 129 and 155 of type 1 are rendered as recommendations for user "Js79009234YU7". Recommendations were delivered by the scenario "also_bought":


User clicks a recommended product 155 that was delivered by the scenario "also_bought":


User "Js79009234YU7" has watched a video 452 (all videos are item type "3"):


User "Js79009234YU7" has watched 60 percent of a video 466:


User "Js79009234YU7" puts products 128 and 129 into the shopping basket.



To buy selected products, user "Js79009234YU7" logs in and obtains an internal identifier (for example, the registration ID) "johndoe" from the site.


The user buys two products from the shopping basket: product 128 (one piece for the price of EUR 19.99) and product 129 (2 pieces for the price of EUR 4.44 each).


User "johndoe" likes the product 133 and wants to rate it with 5 stars.


Response handling

The following HTTP response codes are used by the event tracker.

HTTP Status Code Description
200 OK
204 No Content
Request was successfully processed.
400 Bad Request
414 Request-URI Too Long
The request is wrongly formatted. See response body for more information.
401 Unauthorized Invalid authentication credentials.
403 Forbidden Access denied (not implemented yet).
404 Not Found The customer ID was not found. The event code was not found.
500 Internal Server Error Unspecified error. Contact Ibexa if this error reoccurs frequently.

In case of errors, the body of the response contains human-readable error messages. Human-readable error messages can be changed and should not be used for automated processing.