fix type hints for Python < 3.10

magento/client.py

@@ -607,7 +607,7 @@ def get_orders_items(self, *, sku: Optional[str] = None, query: Query = None, li
 
         return self.get_paginated("/V1/orders/items", query=query, limit=limit, **kwargs)
 
-    def get_order(self, order_id: str | int, *,
+    def get_order(self, order_id: Union[str, int], *,
                   none_on_404=False,
                   none_on_empty=False,
                   **kwargs) -> Order:
@@ -628,15 +628,15 @@ def get_order_by_increment_id(self, increment_id: str, **kwargs) -> Optional[Ord
             return order
         return None
 
-    def hold_order(self, order_id: str | int, **kwargs):
+    def hold_order(self, order_id: Union[str, int], **kwargs):
         """
         Hold an order. This is the opposite of ``unhold_order``.
 
         :param order_id: order id (not increment id)
         """
         return self.post_json_api(f"/V1/orders/{escape_path(order_id)}/hold", **kwargs)
 
-    def unhold_order(self, order_id: str | int, **kwargs):
+    def unhold_order(self, order_id: Union[str, int], **kwargs):
         """
         Un-hold an order. This is the opposite of ``hold_order``.