Добавьте файлы проекта.

PlaylistShared.Shared/DTO/AddTrackRequest.cs

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+using System.Text.Json.Serialization;
+
+namespace PlaylistShared.Shared.DTO;
+
+public class AddTrackRequest
+{
+    [JsonPropertyName("sharedPlaylistToken")]
+    public string SharedPlaylistToken { get; set; } = null!;
+
+    [JsonPropertyName("trackIds")]
+    public List<string> TrackIds { get; set; } = new();
+}