<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\ServicePrincipals\Item\Synchronization\Jobs\Item\ValidateCredentials\ValidateCredentialsPostRequestBody;
use Microsoft\Graph\Beta\Generated\Models\SynchronizationSecretKeyStringValuePair;
use Microsoft\Graph\Beta\Generated\Models\SynchronizationSecret;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new ValidateCredentialsPostRequestBody();
$credentialsSynchronizationSecretKeyStringValuePair1 = new SynchronizationSecretKeyStringValuePair();
$credentialsSynchronizationSecretKeyStringValuePair1->setKey(new SynchronizationSecret('userName'));
$credentialsSynchronizationSecretKeyStringValuePair1->setValue('user@domain.com');
$credentialsArray []= $credentialsSynchronizationSecretKeyStringValuePair1;
$credentialsSynchronizationSecretKeyStringValuePair2 = new SynchronizationSecretKeyStringValuePair();
$credentialsSynchronizationSecretKeyStringValuePair2->setKey(new SynchronizationSecret('password'));
$credentialsSynchronizationSecretKeyStringValuePair2->setValue('password-value');
$credentialsArray []= $credentialsSynchronizationSecretKeyStringValuePair2;
$requestBody->setCredentials($credentialsArray);
$graphServiceClient->servicePrincipals()->byServicePrincipalId('servicePrincipal-id')->synchronization()->jobs()->bySynchronizationJobId('synchronizationJob-id')->validateCredentials()->post($requestBody)->wait();