|null Canonical numbers on the blacklist; null while the report is not final yet. */ public function blacklisted( string $providerMessageId ): ?array; /** * Messages the gateway sent between two moments. * * @param int $from Unix time, inclusive. * @param int $to Unix time, inclusive. * * @return int|string The count, or the reason it could not be read. */ public function sentCount( int $from, int $to ): int|string; }