Make the IsExcludedFromCampaigns field in the AddContactAction type as a pointer with omitempty to not include that field if not set. Otherwise the update request with this field not set will override the previous state to false when it should preserve it.

Author: Tomash Sidei

resources/resources.go

@@ -1185,7 +1185,7 @@ type ContactsListAction struct {
 type AddContactAction struct {
 	Email                   string
 	Name                    string
-	IsExcludedFromCampaigns bool
+	IsExcludedFromCampaigns *bool `json:",omitempty"`
 	Properties              JSONObject
 }