✏️ update changelog and migration guide

CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to the ordercloud-javascript-sdk will be documented in this
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+# [9.0.0] - 2024-12-05
+- This version includes a breaking change that updates the following return types:
+- `ProductCollectionBuyerProduct` (updated from `BuyerProduct`) is the new type returned from `Me.ListProductCollectionEntries` 
+- `ProductCollectionProduct` (updated from `Product`) is the new type returned from `ProductCollections.ListEntries`
+
 # [8.0.2] - 2024-12-03
 - Bug fix for "process is undefined" accessor error when not using NextJS
 

MIGRATION_GUIDE.md

@@ -2,6 +2,31 @@
 
 The objective of this guide is to document the breaking changes and updates required to migrate from one major version to the next.
 
+## version 8.x.x to version 9.x.x
+* The return type for the `Me.ListProductCollectionEntries` method has been updated from `BuyerProduct` to `ProductCollectionBuyerProduct`
+
+    Before:
+    ```typescript
+    ListProductCollectionEntries<TBuyerProduct>(...) : Promise<RequiredDeep<ListPageWithFacets<TBuyerProduct>>>
+    ```
+
+    After:
+    ```typescript
+    ListProductCollectionEntries<TProductCollectionBuyerProduct>(...) : Promise<RequiredDeep<ListPageWithFacets<TProductCollectionBuyerProduct>>>
+    ```
+
+    * The return type for the `ProductCollections.ListEntries` method has been updated from `Product` to `ProductCollectionProduct`
+
+    Before:
+    ```typescript
+    ListEntries<TProduct>(...) : Promise<RequiredDeep<ListPageWithFacets<TProduct>>>
+    ```
+
+    After:
+    ```typescript
+    ListEntries<TProductCollectionBuyerProduct>(...) : Promise<RequiredDeep<ListPageWithFacets<TProductCollectionBuyerProduct>>>
+    ```
+
 ## version 7.x.x to version 8.x.x
 * The return type for the `ListEligiblePromotions` method has been updated from `Promotion` to `OrderPromotion`