diff --git a/model/cloud.go b/model/cloud.go
index 5c396dc9b7..7c63c13875 100644
--- a/model/cloud.go
+++ b/model/cloud.go
@@ -20,8 +20,9 @@ var MockCWS string
 type BillingScheme string
 
 const (
-	BillingSchemePerSeat = BillingScheme("per_seat")
-	BillingSchemeFlatFee = BillingScheme("flat_fee")
+	BillingSchemePerSeat    = BillingScheme("per_seat")
+	BillingSchemeFlatFee    = BillingScheme("flat_fee")
+	BillingSchemeSalesServe = BillingScheme("sales_serve")
 )
 
 type RecurringInterval string