Locate the relevant files in the `extensions/bluebubbles/` directory.
Implement or modify the channel logic in `src/channel.ts`.
Handle inbound webhooks in `src/monitor.ts` using `api.registerHttpHandler`.
Use REST helpers in `src/send.ts` and `src/probe.ts` for sending messages and health checks.
Update the catalog entry in `src/channels/plugins/catalog.ts` for onboarding.
Test the plugin by sending and receiving messages, and verifying webhook functionality.
Monitor logs for any errors or warnings.