Fix: unable to submit requests that use null as pagination

src/Pagination/PagedPaginator.php

@@ -11,7 +11,7 @@
 class PagedPaginator extends BasePagedPaginator
 {
     protected ?int $perPageLimit = 25;
-    protected ?string $paginationOrder = null;
+    protected string $paginationOrder = '';
 
     protected function isLastPage(Response $response): bool
     {
@@ -48,7 +48,7 @@ protected function applyPagination(Request $request): Request
         return $request;
     }
 
-    public function setPaginationOrder(?string $order): static
+    public function setPaginationOrder(string $order): static
     {
         $this->paginationOrder = $order;
 

tests/Feature/Pagination/PagedPaginationTest.php

@@ -87,4 +87,27 @@ public function it_can_set_the_pagination_order()
             }
         });
     }
+
+    /** @test */
+    public function it_can_use_an_empty_string_as_pagination_order_default()
+    {
+        $plytix = new Plytix();
+        $mockClient = MockClient::global([
+            MockResponseFixture::make(fixtureName: 'token.json', status: 200),
+            MockResponseFixture::make(fixtureName: 'product-categories-search-page-1.json', status: 200),
+            MockResponseFixture::make(fixtureName: 'product-categories-search-page-2.json', status: 200),
+        ]);
+
+        $paginator = $plytix->paginate(new ProductCategoriesSearchRequest());
+
+        foreach ($paginator as $response) {
+            // Let's loop so the paginator fetches all pages
+        }
+
+        $mockClient->assertSent(function (Request $request, Response $response) {
+            if ($request instanceof ProductCategoriesSearchRequest) {
+                return Arr::get($request->body()->all(), 'pagination.order') === '';
+            }
+        });
+    }
 }