Revert changes to transferDataTracking

Author: gcatanese

src/typings/transferWebhooks/transferDataTracking.ts

@@ -30,7 +30,11 @@ export type TransferDataTracking = ConfirmationTrackingData | EstimationTracking
 */
 export class TransferDataTrackingClass {
 
-    static readonly discriminator: string = "type";
+    static readonly discriminator: string | undefined = "type";
 
-    static readonly mapping: {[index: string]: string} | undefined = undefined;
+    static readonly mapping: {[index: string]: string} | undefined = {
+        "confirmation": "ConfirmationTrackingData",
+        "estimation": "EstimationTrackingData",
+        "internalReview": "InternalReviewTrackingData"
+    };
 }