> For the complete documentation index, see [llms.txt](https://docs.tryterra.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tryterra.co/faq/help-topics/data-api-sdk/mobile-sdk-setup-permissions-and-crashes/apple-health-permission-list-mapping.md).

# Why are Apple Health activity webhooks empty?

Apple Health data only flows when the **matching HealthKit permission is granted**, and the Health app labels don't always match Terra's data types.

Key mappings and gotchas:

* **Activity payloads** (workout sessions) require the `Workouts` read permission, not the activities permission alone.
* **Daily background delivery** is triggered by step updates, so `STEPS` must be in your permission list even if you only need other data types, or daily webhooks won't fire automatically. The roughly 30-minute interval is iOS-controlled and not configurable.
* **Menstrual flow** is labelled `Cycle Tracking` in the Health app, not Menstruation.

iOS only shows the HealthKit permission sheet **once per permission set**. The auth state lives in the Health app and persists across reinstalls. So if a type is missing:

* Have the user enable it manually under **Settings > Privacy & Security > Health > \[your app]**, or
* QA on a fresh simulator (Erase All Content and Settings) to see the full sheet again.

An undecided permission (e.g. a body category) also makes `initTerra` re-prompt and blocks background delivery for that type until the user responds once. See the [permissions mapping](https://docs.tryterra.co/reference/health-and-fitness-api/sdk-references/permissions-mapping) reference.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.tryterra.co/faq/help-topics/data-api-sdk/mobile-sdk-setup-permissions-and-crashes/apple-health-permission-list-mapping.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.