Add snippet on webhooks

Signed-off-by: macdonst <[email protected]>

app/docs/md/routing/api-routes/webhooks.md

@@ -0,0 +1,29 @@
+---
+title: Webhooks
+---
+
+A webhook is a method of augmenting or altering the behavior of a web page or web application with custom callbacks.
+
+You can use an API route to receive webhooks from third parties:
+
+<doc-code filename="app/api/webhook.mjs">
+
+```javascript
+export async function post (req) {
+  try {
+    const data = req.body
+    // Process the webhook payload
+    // Validate payload, etc.
+  } catch (error) {
+    return {
+      status: 400,
+    }
+  }
+
+  return {
+    status: 200,
+  }
+}
+```
+
+</doc-code>

app/docs/nav-data.mjs

@@ -59,7 +59,7 @@ export const data = [
         path: '/docs/routing/api-routes/',
         label: 'API Routes',
         hasChildren: true,
-        items: [ 'middleware', 'tutorial' ],
+        items: [ 'middleware', 'tutorial', 'webhooks' ],
       },
     ],
   },