Launching Post-Purchase Offers with Rebuy for Existing Customers

Hi all, does anyone have a good suggestion on how to use Rebuy to launch a post purchase offer? What I mean is an offer aiming to a previous purchase made a while ago, not right after the customers check out and paid. Context, we are launching an accessory specifically for an existing product, we want to have some discount for this accessory to the customers who already bought the product in the past. any way to do that?