How are backorders charged?

For your first 50 backorders, there is no charge. Afterward, each backorder sale is billed at $0.75 per backorder.

Klaviyo is already included in the backorders feature. Therefore, there are no additional charges for using Klaviyo. You can utilize Klaviyo as much as you want as long as you are using backorders. Just ensure there are no outstanding backorder payments.