feat: implement updated soundtrack playlist api

rest-helix/src/main/java/com/github/twitch4j/helix/TwitchHelix.java

@@ -927,31 +927,44 @@ HystrixCommand<SoundtrackCurrentTrackWrapper> getSoundtrackCurrentTrack(
     );
 
     /**
-     * Gets a Soundtrack playlist, which includes its list of tracks.
+     * Gets the tracks of a Soundtrack playlist.
      *
-     * @param authToken App access token or User access token.
-     * @param id        The ASIN of the Soundtrack playlist to get.
-     * @return SoundtrackPlaylistTracksWrapper
+     * @param authToken Required: App access token or User access token.
+     * @param id        Required: The ID of the Soundtrack playlist to get.
+     * @param limit     Optional: The maximum number of tracks to return for this playlist in the response. The minimum number of tracks is 1 and the maximum is 50. The default is 20.
+     * @param after     Optional: The cursor used to get the next page of tracks for this playlist. The Pagination object in the response contains the cursor’s value.
+     * @return SoundtrackPlaylistTracksList
      */
     @Unofficial // beta
-    @RequestLine("GET /soundtrack/playlist?id={id}")
+    @RequestLine("GET /soundtrack/playlist?id={id}&first={first}&after={after}")
     @Headers("Authorization: Bearer {token}")
-    HystrixCommand<SoundtrackPlaylistTracksWrapper> getSoundtrackPlaylist(
+    HystrixCommand<SoundtrackPlaylistTracksList> getSoundtrackPlaylist(
         @Param("token") String authToken,
-        @Param("id") String id
+        @Param("id") String id,
+        @Param("first") Integer limit,
+        @Param("after") String after
     );
 
     /**
      * Gets a list of Soundtrack playlists.
+     * <p>
+     * The list contains information about the playlists, such as their titles and descriptions.
+     * To get a playlist’s tracks, call {@link #getSoundtrackPlaylist(String, String, Integer, String)} and specify the playlist’s ID.
      *
-     * @param authToken App access token or User access token.
+     * @param authToken Required: App access token or User access token.
+     * @param id        Optional: The ID of the Soundtrack playlist to get. Specify an ID only if you want to get a single playlist instead of all playlists.
+     * @param limit     Optional: The maximum number of playlists to return in the response. The minimum number of playlists is 1 and the maximum is 50. The default is 20.
+     * @param after     Optional: The cursor used to get the next page of playlists. The Pagination object in the response contains the cursor’s value.
      * @return SoundtrackPlaylistMetadataList
      */
     @Unofficial // beta
-    @RequestLine("GET /soundtrack/playlists")
+    @RequestLine("GET /soundtrack/playlists?id={id}&first={first}&after={after}")
     @Headers("Authorization: Bearer {token}")
     HystrixCommand<SoundtrackPlaylistMetadataList> getSoundtrackPlaylists(
-        @Param("token") String authToken
+        @Param("token") String authToken,
+        @Param("id") String id,
+        @Param("first") Integer limit,
+        @Param("after") String after
     );
 
     /**

rest-helix/src/main/java/com/github/twitch4j/helix/domain/SoundtrackPlaylistMetadataList.java

@@ -1,6 +1,7 @@
 package com.github.twitch4j.helix.domain;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.github.twitch4j.common.annotation.Unofficial;
 import lombok.AccessLevel;
 import lombok.Data;
 import lombok.Setter;
@@ -17,4 +18,10 @@ public class SoundtrackPlaylistMetadataList {
     @JsonProperty("data")
     private List<SoundtrackPlaylistMetadata> playlists;
 
+    /**
+     * Cursor for forward pagination: tells the server where to start fetching the next set of results, in a multi-page response.
+     */
+    @Unofficial
+    private HelixPagination pagination;
+
 }

rest-helix/src/main/java/com/github/twitch4j/helix/domain/SoundtrackPlaylistTracksList.java

@@ -0,0 +1,25 @@
+package com.github.twitch4j.helix.domain;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.AccessLevel;
+import lombok.Data;
+import lombok.Setter;
+
+import java.util.List;
+
+@Data
+@Setter(AccessLevel.PRIVATE)
+public class SoundtrackPlaylistTracksList {
+
+    /**
+     * The list of tracks in the playlist.
+     */
+    @JsonProperty("data")
+    private List<SoundtrackTrack> tracks;
+
+    /**
+     * Cursor for forward pagination; used to tell the server where to start fetching the next set of results, in a multi-page response.
+     */
+    private HelixPagination pagination;
+
+}

rest-helix/src/main/java/com/github/twitch4j/helix/domain/SoundtrackTrack.java

@@ -1,5 +1,6 @@
 package com.github.twitch4j.helix.domain;
 
+import com.fasterxml.jackson.annotation.JsonProperty;
 import lombok.AccessLevel;
 import lombok.Data;
 import lombok.Setter;
@@ -30,6 +31,12 @@ public class SoundtrackTrack {
      */
     private String id;
 
+    /**
+     * The track’s ISRC (International Standard Recording Code).
+     */
+    @JsonProperty("isrc")
+    private String code;
+
     /**
      * The track’s title.
      */