I have tried to create a custom post rest resource.
When I tried to request with postman but I am getting below error.
RuntimeException: Callable "Drupal\custom_resource\Plugin\rest\resource\CustomPrr::post" requires a value for the "$node_type" argument. in Drupal\Component\Utility\ArgumentsResolver->handleUnresolvedArgument() (line 143 of /var/www/html/web/core/lib/Drupal/Component/Utility/ArgumentsResolver.php).
I want to implement a shipping policy that sets a default Flat / Free shipping rate for the globe, then individual Flat / Free shipping rates by country based on the order value.
Here's what I want the admin interface to look like, if it were a custom module: