diff --git a/Examples/destination_plugins/AdjustDestination.swift b/Examples/destination_plugins/AdjustDestination.swift
index fc59b4f0..10eff5fa 100644
--- a/Examples/destination_plugins/AdjustDestination.swift
+++ b/Examples/destination_plugins/AdjustDestination.swift
@@ -36,16 +36,6 @@ import Foundation
 import Segment
 import Adjust
 
-internal struct AdjustSettings: Codable {
-    let appToken: String
-    let setEnvironmentProduction: Bool?
-    let setEventBufferingEnabled: Bool?
-    let trackAttributionData: Bool?
-    let setDelay: Bool?
-    let customEvents: JSON?
-    let delayTime: Double?
-}
-
 @objc
 class AdjustDestination: NSObject, DestinationPlugin, RemoteNotifications {
     let timeline = Timeline()
@@ -53,7 +43,7 @@ class AdjustDestination: NSObject, DestinationPlugin, RemoteNotifications {
     let key = "Adjust"
     var analytics: Analytics? = nil
     
-    internal var settings: AdjustSettings? = nil
+    private var settings: AdjustSettings? = nil
     
     public func update(settings: Settings, type: UpdateType) {
         // we've already set up this singleton SDK, can't do it again, so skip.
@@ -185,3 +175,13 @@ extension AdjustDestination {
         return result
     }
 }
+
+private struct AdjustSettings: Codable {
+    let appToken: String
+    let setEnvironmentProduction: Bool?
+    let setEventBufferingEnabled: Bool?
+    let trackAttributionData: Bool?
+    let setDelay: Bool?
+    let customEvents: JSON?
+    let delayTime: Double?
+}
diff --git a/Examples/destination_plugins/AppsFlyerDestination.swift b/Examples/destination_plugins/AppsFlyerDestination.swift
index 3151096e..c0ef30a8 100644
--- a/Examples/destination_plugins/AppsFlyerDestination.swift
+++ b/Examples/destination_plugins/AppsFlyerDestination.swift
@@ -34,15 +34,9 @@
 // *** To Implement Deep Linking functionality reference: https://support.appsflyer.com/hc/en-us/articles/208874366 ****
 
 import Foundation
+import UIKit
 import Segment
 import AppsFlyerLib
-import  UIKit
-
-private struct AppsFlyerSettings: Codable {
-    let appsFlyerDevKey: String
-    let appleAppID: String
-    let trackAttributionData: Bool?
-}
 
 @objc
 class AppsFlyerDestination: UIResponder, DestinationPlugin  {
@@ -346,3 +340,9 @@ extension AppsFlyerDestination: DeepLinkDelegate, UIApplicationDelegate {
 //        return nil
 //    }
 //}
+
+private struct AppsFlyerSettings: Codable {
+    let appsFlyerDevKey: String
+    let appleAppID: String
+    let trackAttributionData: Bool?
+}
diff --git a/Examples/destination_plugins/FirebaseDestination.swift b/Examples/destination_plugins/FirebaseDestination.swift
index 0cb836da..83037816 100644
--- a/Examples/destination_plugins/FirebaseDestination.swift
+++ b/Examples/destination_plugins/FirebaseDestination.swift
@@ -43,10 +43,6 @@ import FirebaseAnalytics
  An implmentation of the Firebase Analytics device mode destination as a plugin.
  */
 
-struct FirebaseSettings: Codable {
-    let deepLinkURLScheme: String?
-}
-
 class FirebaseDestination: DestinationPlugin {
     let timeline = Timeline()
     let type = PluginType.destination
@@ -124,21 +120,7 @@ extension FirebaseDestination {
     // Maps Segment spec to Firebase constant
     func formatFirebaseEventNames(_ eventName: String) -> String {
         
-        let mappedValues = ["Product Clicked": FirebaseAnalytics.AnalyticsEventSelectContent,
-                            "Product Viewed": FirebaseAnalytics.AnalyticsEventViewItem,
-                            "Product Added": FirebaseAnalytics.AnalyticsEventAddToCart,
-                            "Product Removed": FirebaseAnalytics.AnalyticsEventRemoveFromCart,
-                            "Checkout Started": FirebaseAnalytics.AnalyticsEventBeginCheckout,
-                            "Promotion Viewed": FirebaseAnalytics.AnalyticsEventPresentOffer,
-                            "Payment Info Entered": FirebaseAnalytics.AnalyticsEventAddPaymentInfo,
-                            "Order Completed": FirebaseAnalytics.AnalyticsEventPurchase,
-                            "Order Refunded": FirebaseAnalytics.AnalyticsEventRefund,
-                            "Product List Viewed": FirebaseAnalytics.AnalyticsEventViewItemList,
-                            "Product Added to Wishlist": FirebaseAnalytics.AnalyticsEventAddToWishlist,
-                            "Product Shared": FirebaseAnalytics.AnalyticsEventShare,
-                            "Cart Shared": FirebaseAnalytics.AnalyticsEventShare,
-                            "Products Searched": FirebaseAnalytics.AnalyticsEventSearch]
-        if let mappedEvent = mappedValues[eventName] {
+        if let mappedEvent = FirebaseDestination.mappedValues[eventName] {
             return mappedEvent
         } else {
             return (try? formatFirebaseName(eventName)) ?? eventName
@@ -162,24 +144,10 @@ extension FirebaseDestination {
     
     func returnMappedFirebaseParameters(_ properties: [String: Any]) -> [String: Any] {
         
-        let mappedKeys = ["products": FirebaseAnalytics.AnalyticsParameterItems,
-                          "category": FirebaseAnalytics.AnalyticsParameterItemCategory,
-                          "product_id": FirebaseAnalytics.AnalyticsParameterItemID,
-                          "name": FirebaseAnalytics.AnalyticsParameterItemName,
-                          "brand": FirebaseAnalytics.AnalyticsParameterItemBrand,
-                          "price": FirebaseAnalytics.AnalyticsParameterPrice,
-                          "quantity": FirebaseAnalytics.AnalyticsParameterQuantity,
-                          "query": FirebaseAnalytics.AnalyticsParameterSearchTerm,
-                          "shipping": FirebaseAnalytics.AnalyticsParameterShipping,
-                          "tax": FirebaseAnalytics.AnalyticsParameterTax,
-                          "total": FirebaseAnalytics.AnalyticsParameterValue,
-                          "revenue": FirebaseAnalytics.AnalyticsParameterValue,
-                          "order_id": FirebaseAnalytics.AnalyticsParameterTransactionID,
-                          "currency": FirebaseAnalytics.AnalyticsParameterCurrency]
         
         var mappedValues = properties
         
-        for (key, firebaseKey) in mappedKeys {
+        for (key, firebaseKey) in FirebaseDestination.mappedKeys {
             if var data = properties[key] {
                 
                 mappedValues.removeValue(forKey: key)
@@ -220,3 +188,41 @@ extension FirebaseDestination {
     }
 }
 
+
+private struct FirebaseSettings: Codable {
+    let deepLinkURLScheme: String?
+}
+
+private extension FirebaseDestination {
+    
+    static let mappedValues = ["Product Clicked": FirebaseAnalytics.AnalyticsEventSelectContent,
+                               "Product Viewed": FirebaseAnalytics.AnalyticsEventViewItem,
+                               "Product Added": FirebaseAnalytics.AnalyticsEventAddToCart,
+                               "Product Removed": FirebaseAnalytics.AnalyticsEventRemoveFromCart,
+                               "Checkout Started": FirebaseAnalytics.AnalyticsEventBeginCheckout,
+                               "Promotion Viewed": FirebaseAnalytics.AnalyticsEventPresentOffer,
+                               "Payment Info Entered": FirebaseAnalytics.AnalyticsEventAddPaymentInfo,
+                               "Order Completed": FirebaseAnalytics.AnalyticsEventPurchase,
+                               "Order Refunded": FirebaseAnalytics.AnalyticsEventRefund,
+                               "Product List Viewed": FirebaseAnalytics.AnalyticsEventViewItemList,
+                               "Product Added to Wishlist": FirebaseAnalytics.AnalyticsEventAddToWishlist,
+                               "Product Shared": FirebaseAnalytics.AnalyticsEventShare,
+                               "Cart Shared": FirebaseAnalytics.AnalyticsEventShare,
+                               "Products Searched": FirebaseAnalytics.AnalyticsEventSearch]
+    
+    static let mappedKeys = ["products": FirebaseAnalytics.AnalyticsParameterItems,
+                             "category": FirebaseAnalytics.AnalyticsParameterItemCategory,
+                             "product_id": FirebaseAnalytics.AnalyticsParameterItemID,
+                             "name": FirebaseAnalytics.AnalyticsParameterItemName,
+                             "brand": FirebaseAnalytics.AnalyticsParameterItemBrand,
+                             "price": FirebaseAnalytics.AnalyticsParameterPrice,
+                             "quantity": FirebaseAnalytics.AnalyticsParameterQuantity,
+                             "query": FirebaseAnalytics.AnalyticsParameterSearchTerm,
+                             "shipping": FirebaseAnalytics.AnalyticsParameterShipping,
+                             "tax": FirebaseAnalytics.AnalyticsParameterTax,
+                             "total": FirebaseAnalytics.AnalyticsParameterValue,
+                             "revenue": FirebaseAnalytics.AnalyticsParameterValue,
+                             "order_id": FirebaseAnalytics.AnalyticsParameterTransactionID,
+                             "currency": FirebaseAnalytics.AnalyticsParameterCurrency]
+    
+}
diff --git a/Examples/destination_plugins/FlurryDestination.swift b/Examples/destination_plugins/FlurryDestination.swift
index 26f3a840..aad9419d 100644
--- a/Examples/destination_plugins/FlurryDestination.swift
+++ b/Examples/destination_plugins/FlurryDestination.swift
@@ -42,13 +42,6 @@ import FlurryAnalytics
  An implementation of the Flurry Analytics device mode destination as a plugin.
  */
 
-private struct FlurrySettings: Codable {
-    let apiKey: String
-    let sessionContinueSeconds: Int?
-    let screenTracksEvents: Bool?
-}
-
-
 class FlurryDestination: DestinationPlugin {
     let timeline = Timeline()
     let type = PluginType.destination
@@ -126,3 +119,8 @@ extension FlurryDestination {
     }
 }
 
+private struct FlurrySettings: Codable {
+    let apiKey: String
+    let sessionContinueSeconds: Int?
+    let screenTracksEvents: Bool?
+}