# Send test messages via Redox

During implementation or any other kind of testing, you can simulate sending messages from your system. The test messages go to a mock EHR system, but you can review resulting logs on the <u>Logs</u> page.

> **Rate limit for DevTools**
>
> The rate limit when using any of our DevTools is lower than our standard rate limit. You may send up to 5 API requests per every 5 minutes with any of our test tools. [Learn more about our quotas and constraints](/api-reference/quotas-and-constraints). 

These instructions assume that you’ve already created at least one API key in your development environment. If you haven’t yet, [create and authenticate an OAuth API key](/api-reference/redox-data-model-api/authenticate-an-oauth-api-key).

1. Log in to the Redox dashboard. 
2. From the <u>Environments</u> drop-down on the left-hand menu, select your **development** environment. 


![Select your development environment](https://images.ctfassets.net/cl3wt5ehhnlv/6WidYF8a1lrPpoqHdRMzH7/d802618328c2a687b500092caa5b7d76/Dev-environment.png)

*Select your development environment*


3. From the navigation menu, click the **Developer** page.
4. By default, the <u>Sources</u> tab opens. 
   - _If you use our recommended OAuth API keys_, find the **OAuth API key** you plan to use to authenticate your messages. Click the **Edit** button next to it. 
   - _If you use legacy API keys_, find the **source** associated with the legacy API key and click the **Edit** button next to it. 
5. The <u>Settings</u> page opens. Click the **DevTools (Postman)** tab. This tab contains download links to set up test messages in Postman. [Check out Postman](https://www.postman.com/). 


![Available Postman downloads](https://images.ctfassets.net/cl3wt5ehhnlv/4Iu7KXjBA1JqEs9bq7OEO9/05e8ef488acc903428dd84ebf3b97184/API_keys-devtools.png)

*Available Postman downloads*




> **Developer downloads**
>
> We offer a variety of test tools to help with onboarding, implementation, and testing. [Learn how to use test tools](/how-to-use-redox/use-developer-test-tools), including Postman packages. And, [download test tools from the dashboard](https://dashboard.redoxengine.com/#/organization/122/development/developer/testTools/dev-tools-downloads). 



> **DevTools for sources**
>
> Sources have a second <u>DevTools (Curl)</u> tab. This DevTools allows you to generate test `curl` commands to send from your local machine.


6. Send test messages for your subscription. 
7. Check your logs by navigating to the <u>Logs</u> page. [Learn how to search for logs](/how-to-use-redox/search-for-logs).
8. (Optional) Now that you’ve confirmed you can successfully send, you can test that your destinations receive, too. [Test your destination](/how-to-use-redox/manage-your-redox-setup/test-a-destination). 

> **Bonus articles to explore**
>
> Now that you've sent test API requests, learn how to do the real thing.
>
> - [Review our Basics docs](/basics) for high-level info about the dashboard, Redox connections, and data exchange types. 
>   - For example, [learn about sending real API requests](/basics/data-exchange-with-redox) with Redox.
> - Review our API reference docs for the:
>   - [Redox Data Model API](https://docs.redoxengine.com/permalink/data-model-landing-page)
>   - [Redox FHIR API](https://docs.redoxengine.com/permalink/1lItq4hvr0ZfD3ZLvTsL6P)