Test WordPress api with postman

I have some API endpoints.

For example:

add_action('rest_api_init', function () {
    register_rest_route(MY_APP_NAMESPACE, '/init', array(
        'methods' = 'GET',
        'callback' = function (WP_REST_Request $request) {
            return get_current_user_id();
        }
    ));
}

I am trying to test this endpoint with Postman.

I have generated 'X-WP-Nonce' with my localized script. And I am taking the nonce code from the browser console, and passing it through postman Headers.

But I am getting

{
    "code": "rest_cookie_invalid_nonce",
    "message": "Cookie nonce is invalid",
    "data": {
        "status": 403
    }
}

But when I am trying with Ajax, in the same WordPress environment its works fine.

I think this is happening because the nonce is generated in a different session, so with another client, it can't respond.

My question is how can I test my API's with postman?