Create any conversion or audience based on user history, with a little help of Server-Side GTM and Google Firestore. Set up Firestore Web Tag and two test conversions - more than 3 purchases and the previous purchase was made more than a month ago.
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Firestore Server Tag gets rules from event generated by Firestore Server Client, use Firestore.runTransaction GTM API to read and update user state from Firestore.
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