2601.0.0

BREAKING CHANGES:

• Username & password authentication has been removed. OAuth authentication using "Authorization Code Grant" or "Password Limited Grant" now required (see https://forums.iracing.com/discussion/84226/legacy-authentication-removal-dec-9-2025).
• "IDataClient.GetMemberChartData" method was removed. Use "IDataClient.GetMemberChartDataAsync" instead.
• The "TrackScreenshotService" class has been removed. Use "IDataClient.GetTrackAssetScreenshotUris" or "IDataClient.GetTrackAssetScreenshotUrisAsync" instead.
• The "AddIRacingDataApi(IServiceCollection)" extension method has been removed. Use "AddIRacingDataApi(IServiceCollection, Action)" and use the callback to configure the client options.
• The "AddIRacingDataApiWithCaching(IServiceCollection)" extension method has been removed. Use "AddIRacingDataApiWithCaching(IServiceCollection, Action)" and use the callback to configure the client options.

NEW FEATURE: iRacing OAuth "Authorization Code Grant" Authentication

• Allows authentication using the "/authorize" endpoint via a callback.
• Implement the "IOAuthTokenSource" interface then configure via "iRacingDataClientOptions.UseOAuthTokenSource(...)" method.
• This authentication, or "Password Limited Grant", is now required (see https://forums.iracing.com/discussion/84226/legacy-authentication-removal-dec-9-2025).
• See https://oauth.iracing.com/oauth2/book/token_endpoint.html#authorization-code-grant for more information.

FIXES / NEW IMPLEMENTATIONS:

• Implement "/data/session/reg_drivers_list" to retrieve drivers registered for an active session. (Issue #248)
• Add ability to change iRacing "Data API" base URL (e.g. if you have access to one of iRacing's test environments) via the "ApiBaseUrl" property. (Issue #243)
• Implement the "/data/series/season_list" and "/data/series/season_schedule" endpoints. (Issue #239)