Rest API WordPress

//rest API

add_action( 'rest_api_init', 'my_register_route' );

function my_register_route() {
    register_rest_route( 'luq', 'getuser', array(
                    'methods' => 'POST',
                    'callback' => 'custom_phrase',
                )
            );
}

add_action( 'rest_api_init', 'my_register_route_remove_session' );
function my_register_route_remove_session() {
    register_rest_route( 'luq', 'removesession', array(
                    'methods' => 'POST',
                    'callback' => 'removesession_cb',
                )
            );
}


function custom_phrase($request_data) {
	//ini_set("display_errors",1);
	global $wp,$woocommerce,$wpdb;
	// $data = update_user_meta($_GET['id'], 'wasap_session' ,$_GET['session']) ;
	// $user = get_user_by('id', $_GET['id']) ; 
	// $user->wasap_session = $_GET['session'] ;

	$data = update_user_meta($_POST['id'], 'wasap_session' ,$_POST['wasap_session']) ;
	//$data = update_user_meta(2, 'wasap_session' ,'rrrr') ;
	$user = get_user_by('id', $_POST['id']) ; 
	$user->wasap_session = $_POST['wasap_session'] ;

	// $wasap_session = serialize($_POST['wasap_session']);
	// $data = update_user_meta($_POST['id'], 'wasap_session' ,$wasap_session) ;
	// $user = get_user_by('id', $_POST['id']) ; 
	// $user->wasap_session = $wasap_session ;

    return rest_ensure_response($user);  
}

function removesession_cb(){
$user = delete_user_meta($_POST['id'], 'wasap_session') ;
return rest_ensure_response($user);  
}


//get all user
add_filter('rest_user_query', 'remove_has_published_posts_from_api_user_query', 10, 2);
function remove_has_published_posts_from_api_user_query($prepared_args, $request)
{
    unset($prepared_args['has_published_posts']);

    return $prepared_args;
}



//add usermeta callback
  add_action( 'rest_api_init', 'adding_user_meta_rest' );

    function adding_user_meta_rest() {
       register_rest_field( 'user',
                            'metadata',
                             array(
                               'get_callback'      => 'user_meta_callback',
                               'update_callback'   => null,
                               'schema'            => null,
                                )
                          );
	register_rest_field( 'user',
                            'wasap_session',
                             array(
                               'get_callback'      => 'wasap_meta_callback',
                               'update_callback'   => 'wasap_meta_update',
                               'schema'            => null,
                                )
                          );
    }

  function user_meta_callback( $user, $field_name, $request) {
       return get_user_meta( $user[ 'id' ], 'phone', true );
   }
  function wasap_meta_callback( $user, $meta_value) {
	   return get_user_meta( $user[ 'id' ], 'wasap_session', true );
   }
   function wasap_meta_update( $user, $meta_value) {
	return update_user_meta( $user[ 'id' ], 'wasap_session', $meta_value );
}