<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\AppCatalogs\TeamsApps\TeamsAppsRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new TeamsAppsRequestBuilderGetRequestConfiguration();
$queryParameters = TeamsAppsRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->filter = "id eq 'a5228c26-a9ae-4702-90e0-79a5246d2f7d'";
$queryParameters->expand = ["appDefinitions(\$select=id,authorization)"];
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->appCatalogs()->teamsApps()->get($requestConfiguration)->wait();