> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.vapi.ai/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.vapi.ai/_mcp/server.

1. **Apply Coupons to Subscriptions**: You can now apply coupons by specifying a `couponId` to add to a subscription.

2. **Detect Custom Transcriber Failures in Call End Reasons**: You can now handle cases where a custom transcriber fails during a call with `'pipeline-error-custom-transcriber-failed'`, a new `endedReason` option. This is now accessible in `Call`, `ServerMessageStatusUpdate`, and `ServerMessageEndOfCallReport`.

3. **Corrected Typo in Example Custom Voice Request**: We fixed a typo in `CustomVoice.server`, where the example request now shows how to use the `"message"` parameter instead of the misspelled `"messsage"`.