Read Parcel2Go label hash from order links when Hash is empty

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/Services/Parcel2Go.php

@@ -163,6 +163,25 @@ class Parcel2Go
             ])->throw()->json() ?? [];
     }
 
+    /**
+     * Parcel2Go leaves the order's Hash empty and puts the label hash in its "labels-a4" link instead.
+     *
+     * @param  array<string, mixed>  $order
+     */
+    public function labelHash(array $order): ?string
+    {
+        if (filled($order['Hash'] ?? null)) {
+            return (string) $order['Hash'];
+        }
+        $link = collect($order['Links'] ?? [])->first(fn ($link): bool => is_array($link) && str_starts_with((string) ($link['Name'] ?? ''), 'labels-a4'))['Link'] ?? null;
+        if (! is_string($link)) {
+            return null;
+        }
+        parse_str((string) parse_url($link, PHP_URL_QUERY), $query);
+
+        return filled($query['hash'] ?? null) ? (string) $query['hash'] : null;
+    }
+
     public function labelPdf(string $reference, string $hash): string
     {
         $token = $this->profileConnected() ? $this->profileAccessToken() : $this->accessToken();