$url ="https://marketplace.walmartapis.com/v3/items?nextCursor=250&includeDetails=true&offset=0&limit=20";
this url not working giving error in the walmart.
[error] => Array ( [0] => Array ( [code] => INVALID_REQUEST.GMP_ITEM_QUERY_API [field] => 400_BAD_REQUEST [description] => Bad Request. Missing Important Headers ( like ConsumerId) or Inputs. [info] => Request invalid. [severity] => ERROR [category] => DATA )
)