                 self.title = title
                 self.subtitle = subtitle
                 self.attachmentUrl = attachmentUrl
-                
-                
+                self.apnsCollapseId = apnsCollapseId
             }
             
             internal var jsonFormat: [String: Any]? {

             - parameter title:    (Optional) APNs iOS 10 title value.
             - parameter subtitle:    (Optional) APNs iOS 10 subtitle value.
             - parameter attachmentUrl:    (Optional) APNs iOS 10 media url.
             
             */
            public init(badge: Int? = nil, interactiveCategory: String? = nil, iosActionKey: String? = nil, sound: String? = nil, type: ApnsType? = nil, payload: [String: Any]? = nil, titleLocKey: String? = nil, locKey: String? = nil, launchImage: String? = nil, titleLocArgs: [String]? = nil, locArgs: [String]? = nil, title: String? = nil, subtitle: String? = nil,  attachmentUrl: String? = nil) {
                
                self.badge = badge
                self.interactiveCategory = interactiveCategory

            let title: String?
            let subtitle: String?
            let attachmentUrl: String?
            let apnsCollapseId: String?
            
            /**
             The required intializer for the `Apns` class.
