19 declare(strict_types=1);
    25     public function exists(
int $sender_id, 
int $receiver_id): bool;
 findBySenderIdAndReceiverId(int $sender_id, int $receiver_id)
 
store(AutoresponderDto $auto_responder)
 
findByReceiverId(int $receiver_id)
 
deleteBySenderId(int $sender_id)
 
findBySenderId(int $sender_id)
 
exists(int $sender_id, int $receiver_id)