appwrite/src/Appwrite/Messaging/Adapter.php

<?php

namespace Appwrite\Messaging;

abstract class Adapter
{
    abstract public function subscribe(string $projectId, mixed $identifier, array $roles, array $channels): void;
    abstract public function unsubscribe(mixed $identifier): void;
    abstract public static function send(string $projectId, array $payload, array $events, array $channels, array $roles, array $options): void;
}