We start pulling revenue data on a daily basis from the platforms powering your flows (ex. Klaviyo, Attentive) and we adhere to the attribution setting each platform has in place at the time of ingestion. These platforms typically attribute revenue to a flow when the user purchases within a window of time after entering the flow - so it's not uncommon for revenue to be attributed a few days later.
For example - Klaviyo has a 5 day attribution window for emails by default. This means that the revenue attributed to an email sent 4 days in the past can increase if a qualifying user makes a purchase today.