Move gateway reference generation to gateway checkout service

src/Library/Economy/Payment/PaypalGateway.php

@@ -224,18 +224,13 @@ class PaypalGateway implements GatewayInterface
         ];
     }
 
-    private function getPaypalReference(GatewayCheckout $checkout, GatewayCharge $charge): string
-    {
-        return sprintf('CO%d-CH%d', $checkout->getId(), $charge->getId());
-    }
-
     private function getPaypalPurchaseUnits(GatewayCheckout $checkout): array
     {
         $units = [];
 
         foreach ($checkout->getCharges() as $charge) {
             $money = $this->getPaypalMoney($charge);
-            $reference = $this->getPaypalReference($checkout, $charge);
+            $reference = $this->checkoutService->getGatewayReference($checkout, $charge);
 
             $units[] = [
                 'reference_id' => $reference,

src/Service/GatewayCheckoutService.php

@@ -3,6 +3,8 @@
 namespace App\Service;
 
 use App\Controller\GatewaysController;
+use App\Entity\GatewayCharge;
+use App\Entity\GatewayCheckout;
 use Symfony\Component\Routing\RouterInterface;
 
 class GatewayCheckoutService
@@ -12,8 +14,7 @@ class GatewayCheckoutService
 
     public function __construct(
         private RouterInterface $router,
-    ) {
-    }
+    ) {}
 
     public function generateRedirectUrl(string $gateway, string $type = self::RESPONSE_TYPE_SUCCESS, array $parameters = []): string
     {
@@ -26,4 +27,15 @@ class GatewayCheckoutService
             RouterInterface::ABSOLUTE_URL
         );
     }
+
+    public function getGatewayReference(GatewayCheckout $checkout, GatewayCharge $charge): string
+    {
+        return sprintf(
+            'AO%d-CO%d-CH%d-AT%d',
+            $checkout->getOrigin()->getId(),
+            $checkout->getId(),
+            $charge->getId(),
+            $charge->getTarget()->getId()
+        );
+    }
 }