/product-groups/tridion/tridion-docs/b/weblog/posts/tridion-docs-openapi-how-to-make-the-first-callREST API has become a standard capability that customers and prospects are expecting or asking for. Why? One reason is its ease of use for both humans and computers to discover and understand the capabilities of a service using the OpenAPI Specificaten-USTelligent Community 12 Non-Productionhttps://uat.community.rws.com/product-groups/tridion/tridion-docs/b/weblog/posts/tridion-docs-openapi-how-to-make-the-first-callFri, 13 Dec 2024 22:33:55 GMT10acfa76-f078-475b-a7ef-fc5b3e8d2934:3ccd9eaf-6fa8-44f8-b6ae-a0116179c117Damian Jewett1<p>I tried following all of these steps into order to retrieve a bearer token so I can access the OpenAPI, but when I try running my token endpoint in Postman, I always get&nbsp;&quot;error&quot;: &quot;invalid_client&quot;. The token endpoint I&#39;m using looks like this:&nbsp;<span>https://&lt;docs cms domain&gt;/ISHID/connect/token</span></p> <p><span>I added the new service user in AM, then added a new user in the Docs CMS Settings. Then I added both the service user&#39;s name from AM, as well as the client ID to the user in the Docs CMS, under External ID, separated by a comma, similar to your animation.</span></p> <p><span>Where can I find a sample POST request or other documentation that will clarify what all of the headers, body, etc. should look like in my POST request?</span></p><img src="https://uat.community.rws.com/aggbug?PostID=10625&AppID=153&AppType=Weblog&ContentType=0" width="1" height="1">