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ytLlive/Services/index.md
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# Services — index
External-facing logic: YouTube API, persistence. See
[`schema.md`](../schema.md) for the memory-map conventions.
| File | Purpose |
|------|---------|
| `YouTubeAuthService.cs` | OAuth2 via Google: loopback callback (`http://localhost:8765/oauth2/callback`), token exchange, refresh, channel fetch. Constructor takes optional `HttpClient` + `sessionChanged` callback (test seam + save hook); session persists via `Helpers/TokenStore` (DPAPI) |
| `YouTubeStreamService.cs` | Broadcast/stream management via the v3 API (`enableAutoStart/Stop`). **Not yet switched to the `variable` reusable stream** |
| `YouTubeChatService.cs` | Polls `liveChat/messages`, raises `MessageReceived`; `IDisposable` |
| `LayoutStore.cs` | SQLite persistence (`Microsoft.Data.Sqlite`) at `%APPDATA%\ytLlive\ytLlive.db`; assets stored as BLOBs keyed by SHA-256 content hash; save/open layout files |
Related: constructed in [`ViewModels/MainViewModel.cs`](../ViewModels/MainViewModel.cs)
(no DI container yet). Models in [`Models/index.md`](../Models/index.md).
OAuth credentials live in [`Helpers/OAuthCredentials.cs`](../Helpers/OAuthCredentials.cs).