chore(docs): Generated References (automated) (#11395)

Generated the following references:
- `api_key`
- `auth`
- `cart`
- `core_flows`
- `currency`
- `customer`
- `fulfillment`
- `inventory_next`
- `js_sdk`
- `medusa`
- `medusa_config`
- `modules`
- `modules_sdk`
- `notification`
- `order`
- `payment`
- `payment_models`
- `payment_provider`
- `pricing`
- `product`
- `promotion`
- `region`
- `sales_channel`
- `stock_location_next`
- `store`
- `tax`
- `types`
- `user`
- `utils`

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>
Co-authored-by: Shahed Nasser <27354907+shahednasser@users.noreply.github.com>

www/apps/resources/references/notification/classes/notification.AbstractNotificationProviderService/page.mdx

@@ -87,6 +87,19 @@ class MyNotificationProviderService extends AbstractNotificationProviderService
 export default MyNotificationProviderService
 ```
 
+### identifier
+
+Each notification provider has a unique ID used to identify it.
+
+#### Example
+
+```ts
+class MyNotificationProviderService extends AbstractNotificationProviderService {
+  static identifier = "my-notification"
+  // ...
+}
+```
+
 ### validateOptions
 
 This method validates the options of the provider set in `medusa-config.ts`.