docs: integrate shipstation guide (#10623)

* first draft

* finalized first draft + added link to sidebar

* fix lint errors

* type changes

* updates to createFulfillment

* updates

* more updates

* add package weight

* added note about package

* fix up order items fulfillment

* add meta image

* address comment

www/apps/resources/app/integrations/page.mdx

@@ -28,7 +28,7 @@ An Auth Module Provider authenticates users with their account on a third-party
   className="mb-1"
 />
 
-Learn how to create a custom third-party authentication provider in [this guide](/references/auth/provider).
+Learn how to integrate a custom third-party authentication provider in [this guide](/references/auth/provider).
 
 ---
 
@@ -66,7 +66,29 @@ A File Module Provider uploads and manages assets, such as product images, on a
   className="mb-1"
 />
 
-Learn how to create a custom third-party file or storage provider in [this guide](/references/file-provider-module).
+Learn how to integrate a custom third-party file or storage provider in [this guide](/references/file-provider-module).
+
+---
+
+## Fulfillment
+
+A Fulfillment Module Provider provides fulfillment options during checkout, calculates shipping rates, and processes an order's fulfillments.
+
+<CardList
+  items={[
+    {
+      href: "/integrations/guides/shipstation",
+      title: "ShipStation",
+      badge: {
+        variant: "blue",
+        children: "Guide"
+      }
+    }
+  ]}
+  className="mb-1"
+/>
+
+Learn how to create a Fulfillment Provider Module [this guide](/references/fulfillment/provider).
 
 ---