SUBSCRIBERS ONLY

Carrying a Banner Click to the Purchase: Item Enrichment with sGTM, Firestore and BigQuery

In sGTM, information carried by one event can be stored in Firestore and written server-side onto the items of a later event from the same visitor. This post applies item enrichment to the gap left by GA4 not carrying promotion data between events: select_promotion is written to Firestore under the GA client_id key and added to matching items when purchase arrives. Architecture, setup and BigQuery reading are shown on a sample flow for banners that lead to a product and to a collection.