wp-rest.php

<?php

add_action( 'rest_api_init', function () {
  register_rest_route( 'me/favorite', 'add', array(
      'methods'  => 'GET',
      'callback' => 'rest_test',
  ) );
} );

function wp_send_rest_success( $response = array() ) {
  $defaults = array(
      'code'    => '',
      'message' => '',
      'success' => true,
      'data'    => array( 'status' => '200' ),
  );
  $response = wp_parse_args( $response, $defaults );
  wp_send_json( $response );
}

function wp_send_rest_error( $response = array() ) {
  $defaults = array(
      'code'    => '',
      'message' => '',
      'success' => false,
      'data'    => array( 'status' => '200' ),
  );
  $response = wp_parse_args( $response, $defaults );
  wp_send_json( $response );
}

function rest_test() {
  print_r(func_get_args()); die;
  if ( !is_user_logged_in() ) {
    $response = array(
        'code'    => 'unauthorized',
        'message' => __( 'You are not authorized to perform this action', 'smg' ),
        'data'    => array( 'status' => '403' )
    );
    wp_send_rest_error( $response );
  }
  wp_send_rest_error( array( 'code' => 'ok' ) );
}