You can use a Back in Stock campaign to make up for not having a Back in Stock flow that works automatically. Usually better for stores that don’t typically go out of stock and only need to send an email like this every once in a while.
Engage with customers that view a product but then don’t go into the cart, checkout, and purchase. The three SMS variation starts with an initial reminder of the product the customer was viewing, then offers a discount for customers that didn’t purchase in a second SMS. Finally, the third SMS is a follow-up to those that do not use the coupon. Stores must have a script installed on their site for this to work so that “Viewed Product” events are being passed to Klaviyo. Also once the script is installed, this flow will only trigger customers/prospects where you already have their SMS.