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Before the Personalization service can generate implicit recommendations, it must collect events and calculate the results based on user behavior. The most important events collected by the service are CLICK and BUY events. They are enough for providing basic recommendations. There are some additional events for creating more complex scenarios and providing statistics about the acceptance of recommendations, such as conversion rate or revenue. 

Events in a purchase process

The table below lists all possible events that could be used in the system.

Event Description
CLICK Sent to the Personalization service when a user opens a page on the website.
BUY Sent if something was purchased.
CONSUME Similar to the BUY event but without a payment. Designed for content publisher websites. Sent when an article or a web page is consumed (read or watched).
RENDER Sent when a recommendation is shown on the web page. This information is used by filters to suppress repeated recommendations of the same item.
FOLLOW / CLICKRECOMMENDED Sent when a user clicks the recommended product. Used in acceptance statistics.
TRANSFER / LOGIN A special type of event to deal with user login after the user already surfed on the web page anonymously. Always sent when the identifier of the user changes. As a result, the anonymous history of the user is transferred to the new identifier. This happens automatically in the Personalization service.
BASKET Sent when the user adds the specified product to the shopping cart. Enables creating recommendations for products that customers are interested in but ultimately did not purchase.
BLACKLIST Allows a user to suppress currently displayed recommendations. When the Personalization service receives this event, the product or content item is no longer recommended to the specified user. By default, recommendations are suppressed for one year.
OWNS Same as BUY, but does not influence the statistics. Can be sent when a user already owns the product that was purchased somewhere else, to avoid recommending it again.
RATE Additional models can be created with this type of events. Allows building recommendations not only for implicit tracking events like CLICK or BUY, but also for events with explicit value like "rated" or "liked". These events need additional integration into the web page to allow the user to give an appropriate feedback. The event is triggered as a result of this user feedback.

All events require the current user ID and the ID of one or more context items. Some events require additional information. Sophisticated algorithms and result filtering require event types with additional parameters. The table below provides a brief overview of additional parameter information.

Event Additional information
CLICK Category path of the product a customer clicked on can be attached to the event. It is an alternative way to provide this information for a product without having a catalogue/export. Ignored if an export is available to be fed into the Personalization service.
BUY The price that a user paid for the product. This is an important parameter for the statistics. For revenue statistics, it must be sent together with a quantity of the products bought.
FOLLOW / CLICKRECOMMENDED The scenario which provided the recommendations must be sent in this event.
RATE The rating (for example 1 to 5 stars) can be sent as an additional parameter.