public function get_collection_params() {

		$params = parent::get_collection_params();

		$params['permissions'] = array(
			'description' => __( 'Include only API keys matching a specific permission.', 'lifterlms' ),
			'type'        => 'string',
			'enum'        => array_keys( LLMS_REST_API()->keys()->get_permissions() ),
		);

		$params['user'] = array(
			'description' => __( 'Include only keys for the specified user(s). Accepts a single id or a comma separated list of ids.', 'lifterlms' ),
			'type'        => 'string',
		);

		$params['user_not_in'] = array(
			'description' => __( 'Exclude keys for the specified user(s). Accepts a single id or a comma separated list of ids.', 'lifterlms' ),
			'type'        => 'string',
		);

		return $params;

	}