chore(docs): autopopulate api key

fern/docs.yml

@@ -455,6 +455,9 @@ navigation:
             path: ./pages/fern-docs/content/api-playground.mdx
             icon: fa-regular fa-square-terminal
             contents:
+              - page: Auto-populate API Keys
+                icon: fa-regular fa-key
+                path: ./pages/fern-docs/content/autopopulate-api-key.mdx
               - page: Advanced Configuration
                 icon: fa-regular fa-wrench
                 path: ./pages/fern-docs/content/customize-api-playground.mdx

fern/pages/fern-docs/content/autopopulate-api-key.mdx

@@ -0,0 +1,14 @@
+---
+title: Auto-populate API keys
+subtitle: Make integrating with your API frictionless by adding your login flow to the API Playground.
+---
+
+<Tip>
+This feature is available on the Enterprise plan. [Contact us](https://buildwithfern.com/contact) to learn more.
+</Tip>
+
+Fern can integrate with your authentication flow, allowing users to login and have their API key automatically populated with the click of a button. 
+
+<div style="position: relative; padding-bottom: 66.38846737481032%; height: 0;"><iframe src="https://www.loom.com/embed/790eb5849f1c4622aae09527908fdc7a?sid=d77062f8-35c3-41ab-8669-4c28b62e233b?hide_owner=true&hide_share=true&hide_title=true&hideEmbedTopBar=true" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen style="position: absolute; top: 0; left: 0; width: 100%; height: 100%;"></iframe></div>
+
+With this feature, you can **create new users of your API** directly from within your documentation.