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You can do this with or without Interesting Moments. I would suggest a smart campaign triggered by a purchase (assuming you have that data synced), and a filter of "clicked link in email" or at least "opened email" in the last 2 days or so. Or, you could use a unique link in the email that can only be accessed via the email, and you could have a "visited webpage" filter. One advantage of this last option is that you can capture anyone who made a purchase even if the email wasn't sent directly to them, or if it was sent to a different email address than they used to make a purchase.
Then your flow steps could involve adding to an SFDC campaign, setting up interesting moments, just changing a program status to Converted or similar, or any number of other things.