protected function parse_args() {

		// Sanitize post & user ids.
		foreach ( array( 'include', 'exclude', 'user', 'user_not_in' ) as $key ) {
			$this->arguments[ $key ] = $this->sanitize_id_array( $this->arguments[ $key ] );
		}

		// Validate permissions.
		$permissions = $this->get( 'permissions' );
		if ( $permissions && ! in_array( $permissions, array_keys( LLMS_REST_API()->keys()->get_permissions() ), true ) ) {
			$this->arguments['permissions'] = '';
		}

	}