add doc for msf

docs/store-operations/shipping/msf-international-enhancements.mdx

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+# Shipping - International Enhancements for Multi-Storefront
+
+When you sell internationally or to mulitple customer segments, you may want the available shipping methods for a shipping zone to depend on the shopper's region or segment.
+
+To localize your storefront, you can have zones that display different methods depending on the storefront channel. 
+Specify the storefront channel(s) where you want a shipping method to appear when you create a method for a zone. Shoppers only see the shipping method for the zone if it applies to a channel.
+
+## Limitations
+
+You can't assign the following to a specific channel:
+- The free shipping method on [static shipping quotes](https://support.bigcommerce.com/s/article/Shipping-Methods#static).
+- [Pickup methods](/docs/integrations/buy-online-pick-up-in-store#pickup-methods-api) on stores using Buy Online Pickup in Store.
+
+We don't support multiple accounts of the same carrier (e.g., using distinct accounts for UPS)
+
+## Settings
+
+Shipping methods have a `channels` setting. This setting determines which channels can display the shipping zone's method. Shipping methods are available on all channels by default.
+
+For reference, see the [Shipping method](/docs/rest-management/shipping-v2/shipping-method) endpoint of the REST Management API.
+
+## Example
+
+The following example creates a shipping method in a zone by sending a request to the [Create a shipping method](/docs/rest-management/shipping-v2/shipping-method#create-a-shipping-method) endpoint. 
+
+<Tabs items={['Request', 'Response']}>
+  <Tab>
+
+  ```http filename="Example request: Create a shipping method for a zone" showLineNumbers copy
+  POST https://api.bigcommerce.com/stores/{{store_hash}}/v2/shipping/zones/{{zone_id}}/methods
+  X-Auth-Token: {{ACCESS_TOKEN}}
+  Accept: application/json
+  Content-Type: application/json
+
+  {
+    "name": "Per Order",
+    "type": "perorder",
+    "settings": {
+      "rate": 8
+    },
+    "enabled": true,
+    "handling_fees": {
+      "fixed_surcharge": "3"
+    },
+    "channels": [1, 3]
+  }
+  ```
+
+  </Tab>
+  <Tab>
+
+  ```json filename="Example response: Create a shipping method for a zone" showLineNumbers copy
+  {
+    "id": 5,
+    "name": "Per Order",
+    "type": "perorder",
+    "settings": {
+        "rate": 8
+    },
+    "enabled": true,
+    "handling_fees": {
+        "fixed_surcharge": "3"
+    },
+    "channels": [1, 3]
+  }
+  ```
+
+  </Tab>
+</Tabs>
+
+
+## Additional resources
+
+- [Introduction to Multi-Storefront](/docs/storefront/multi-storefront)
+- [Shipping methods](/docs/rest-management/shipping-v2/shipping-method) endpoint reference