[API] Một ví dụ sử dụng phương thức GET, POST cơ bản :) (ok)

<?php
/**
 * This is our callback function to return our products.
 *
 * @param WP_REST_Request $request This function accepts a rest request to process data.
 */
function prefix_get_products($request) {
  // In practice this function would fetch the desired data. Here we are just making stuff up.
  $products = array(
    '1' => 'I am product 1',
    '2' => 'I am product 2',
    '3' => 'I am product 3',
  );
  return rest_ensure_response($products);
}
/**
 * This is our callback function to return a single product.
 *
 * @param WP_REST_Request $request This function accepts a rest request to process data.
 */
function prefix_create_product($request) {
  // In practice this function would create a product. Here we are just making stuff up.
  return rest_ensure_response('Product has been created');
}
/**
 * This function is where we register our routes for our example endpoint.
 */
function prefix_register_product_routes() {
  // Here we are registering our route for a collection of products and creation of products.
  register_rest_route('my-shop/v1', '/products', array(
    array(
      // By using this constant we ensure that when the WP_REST_Server changes, our readable endpoints will work as intended.
      'methods'  => WP_REST_Server::READABLE,
      // Here we register our callback. The callback is fired when this endpoint is matched by the WP_REST_Server class.
      'callback' => 'prefix_get_products',
    ),
    array(
      // By using this constant we ensure that when the WP_REST_Server changes, our create endpoints will work as intended.
      'methods'  => WP_REST_Server::CREATABLE,
      // Here we register our callback. The callback is fired when this endpoint is matched by the WP_REST_Server class.
      'callback' => 'prefix_create_product',
    ),
  ));
}
add_action('rest_api_init', 'prefix_register_product_routes');
?>