BP_Invitation::mark_accepted( int $id )

	public static function mark_accepted( $id = 0 ) {

		if ( ! $id ) {
			return false;
		}

		// Values to be updated
		$update_args = array(
			'accepted' => 'accepted',
		);

		// WHERE clauses
		$where_args = array(
			'id' => $id,
		);

		return self::update( $update_args, $where_args );
	}