One integration does two jobs. It syncs spend per day and ad (Performance Max per campaign) so ROAS sits next to attributed revenue, and it uploads conversions so Smart Bidding optimises on real sales.
Conversions are uploaded about 30 seconds after they happen, with the most recent gclid, gbraid or wbraid from the person's journey (clicks up to 90 days old), the order value net of refunds, and the order id for deduplication. Hashed email and phone are added as enhanced conversions, so Google can match conversions even without a click id. Connect with Google to pick the account and conversion actions; accounts reached through a manager (MCC) are listed too.