> For the complete documentation index, see [llms.txt](https://docs.payments.thalescloud.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payments.thalescloud.io/click-to-pay-merchants/backend-integration/health-check.md).

# Health check

Use health checks to detect connectivity issues early.

<figure><img src="broken://spaces/O4Alaz7Oc1lNUVi3QiVW/files/gZysa7Kk74hb0OHVK2pA" alt=""><figcaption><p>Bidirectional health check traffic</p></figcaption></figure>

### How it works ?

Every **60 seconds**, a `GET /healthcheck` request is sent:

* From your backend to Thales backend.
* From Thales backend to your backend.

The maximum allowed response time is **5 seconds**.

Both directions are monitored independently.

### Environments

Health checks are required in **Production Environment**.

{% hint style="info" %}
Treat repeated health check failures as a connectivity incident. Validate mutual TLS configuration first.
{% endhint %}


---

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