[Billing] Update for php-sdk

Author: that-guy-iain

src/Parthenon/Billing/BillaBear/SdkFactory.php

@@ -25,9 +25,10 @@
 use BillaBear\Api\InvoicesApi;
 use BillaBear\Api\PaymentDetailsApi;
 use BillaBear\Api\SubscriptionsApi;
+use BillaBear\Api\UsageApi;
 use BillaBear\Configuration;
 
-class SdkFactory
+final class SdkFactory
 {
     public function __construct(
         private string $apiUrl,
@@ -71,6 +72,14 @@ public function createInvoiceApi(): InvoicesApi
         return $apiInstance;
     }
 
+    public function createUsageApi(): UsageApi
+    {
+        $config = $this->createConfig();
+        $usageInstance = new UsageApi(config: $config);
+
+        return $usageInstance;
+    }
+
     public function createConfig(): Configuration
     {
         $config = Configuration::getDefaultConfiguration();