try

app/Modules/CardTransaction/CardTransactionModule.php

@@ -2,6 +2,8 @@
 
 namespace App\Modules\CardTransaction;
 
+use App\Modules\Core\ModulePackage;
+use App\Modules\Core\ModulePackageType;
 use App\Modules\Makeable;
 use App\Modules\ModuleContract;
 
@@ -51,7 +53,13 @@ class CardTransactionModule implements ModuleContract
      */
     public function getComposerRequirements(): array
     {
-        return [];
+        return [
+            new ModulePackage(
+                type: ModulePackageType::PACKAGE,
+                name: 'mpdf/mpdf',
+                message: 'Required for pdf conversations'
+            ),
+        ];
     }
 
     /**