Timing: 48 to 96 hours

Not 24 hours (too soon, feels automated). Not 7 days (too late, momentum gone). The 48-96 hour window is when the guest still has the taste in memory but the decision window is closing.

Copy: short, specific, not promotional

'Your saffron latte misses you.' beats 'Come back for 20% off!' by 3-4x in our data. Reference a specific product, skip the discount, keep it under 60 characters.

Offer: small or none

A free drink with a purchase converts better than a percentage off. A small stamp bonus (earn 2x today) converts nearly as well as a monetary offer at a fraction of the margin cost. The offer is not the reason they come back, the reminder is.