Backtrace SDK can help detect and report handled and unhandled exceptions, errors, and crashes in iOS app extensions, enabling richer inter-app communication and tighter integration with OS services. To integrate Backtrace SDK into an iOS app extension project, developers need to download the latest archive, copy specific frameworks and files into their project root, create a new directory for the framework, add bridging header files, and configure Xcode settings. The developer then creates an Obj-C class called `BacktraceWrapper` that wraps the Backtrace SDK functionality, which includes sending errors with attributes using the `sendError:attributes:` method. Additionally, Swift support is available through bridging headers, and uploading debug symbols to Backtrace is required for production deployment. With this integration, extensions can now have the same error reporting capabilities as the app itself, simplifying debugging in production.