Refactor: Plan and Subscription exports to named exports in model files

src/models/Plan.ts

@@ -59,4 +59,4 @@ const PlanSchema = new Schema<IPlan>(
     }
 );
 
-export default mongoose.models.Plan || mongoose.model<IPlan>("Plan", PlanSchema);
+export const Plan = mongoose.models.Plan || mongoose.model<IPlan>("Plan", PlanSchema);

src/models/Subscription.ts

@@ -48,4 +48,4 @@ const SubscriptionSchema = new Schema<ISubscription>(
     }
 );
 
-export default mongoose.models.Subscription || mongoose.model<ISubscription>("Subscription", SubscriptionSchema);
+export const Subscription = mongoose.models.Subscription || mongoose.model<ISubscription>("Subscription", SubscriptionSchema);

src/models/index.ts

@@ -11,10 +11,10 @@ export {
     Menu
 } from "./Menu";
 export {
-    default as Plan
+    Plan
 } from "./Plan";
 export {
-    default as Subscription
+    Subscription
 } from "./Subscription";
 export {
     RecommendedProduct