Add PayPal support for add-on and gift voucher checkout

app/Services/Addons/EventAddonCatalog.php

@@ -21,6 +21,8 @@ class EventAddonCatalog
                     'label' => $addon->label,
                     'variant_id' => $addon->variant_id,
                     'increments' => $addon->increments,
+                    'price' => $this->resolveMetadataPrice($addon->metadata ?? []),
+                    'currency' => 'EUR',
                 ]];
             })
             ->all();
@@ -46,6 +48,26 @@ class EventAddonCatalog
         return $addon['variant_id'] ?? null;
     }
 
+    public function resolvePrice(string $key): ?float
+    {
+        $addon = $this->find($key);
+
+        if (! $addon) {
+            return null;
+        }
+
+        $price = $addon['price'] ?? $addon['price_eur'] ?? null;
+
+        return is_numeric($price) ? (float) $price : null;
+    }
+
+    protected function resolveMetadataPrice(array $metadata): ?float
+    {
+        $price = $metadata['price_eur'] ?? null;
+
+        return is_numeric($price) ? (float) $price : null;
+    }
+
     /**
      * @return array<string, int>
      */