Chỉnh sửa woocommerce countries, states, continents (ok)

wp-content\themes\astra-child\functions.php

add_filter('woocommerce_countries', 'custom_us_countries', 10, 1);
function custom_us_countries($countries) {
  $countries = [
    "VN" => "Việt Nam",
    "ND" => "Nam Định",
    "HN" => "Hà Nội",
  ];
  return $countries;
}
add_filter('woocommerce_states', 'custom_us_states', 10, 1);
function custom_us_states($states) {
  $states = [
    'ND' => [ // Nam Định states.
      'ND-01' => __('ND1', 'woocommerce'),
      'ND-02' => __('ND2', 'woocommerce'),
      'ND-03' => __('ND3', 'woocommerce'),
      'ND-04' => __('ND4', 'woocommerce'),
      'ND-05' => __('ND5', 'woocommerce'),
      'ND-06' => __('ND6', 'woocommerce'),
    ],
    'HN' => [ // Hà Nội states.
      'HN-01' => __('HN1', 'woocommerce'),
      'HN-02' => __('HN2', 'woocommerce'),
      'HN-03' => __('HN3', 'woocommerce'),
      'HN-04' => __('HN4', 'woocommerce'),
      'HN-05' => __('HN5', 'woocommerce'),
      'HN-06' => __('HN6', 'woocommerce'),
    ],
  ];
  $states['VN'] = array_merge($states['ND'], $states['HN']);
  return $states;
}
add_filter('woocommerce_continents', 'custom_us_continents', 10, 1);
function custom_us_continents($continents) {
  $continents = [
    'AS' => [
      'name'      => __( 'Việt Nam', 'woocommerce' ),
      'countries' => array(
        'ND',
        'HN'
      ),
    ]
  ];
  return $continents;
}
add_filter( 'woocommerce_countries_base_country', 'wp_kama_woocommerce_customer_country', 10, 1 );
function wp_kama_woocommerce_customer_country($country) {
  $country = "ND";
  return $country;
}

query GetCountryStates {
  wooStates(countryCode: "ND") {
    states {
      stateCode
      stateName
    }
  }
}

{
  "data": {
    "wooStates": {
      "states": [
        {
          "stateCode": "ND-01",
          "stateName": "ND1"
        },
        {
          "stateCode": "ND-09",
          "stateName": "ND2"
        },
        {
          "stateCode": "ND-02",
          "stateName": "ND3"
        },
        {
          "stateCode": "ND-03",
          "stateName": "ND4"
        },
        {
          "stateCode": "ND-04",
          "stateName": "ND5"
        },
        {
          "stateCode": "ND-05",
          "stateName": "ND6"
        }
      ]
    }
  }
}