ClientCredentialsGrant example

$accessTokenInterval = new \DateInterval($this->accessTokenTtl);
        $refreshTokenInterval = new \DateInterval($this->refreshTokenTtl);

        $passwordGrant = new PasswordGrant($this->userRepository, $this->refreshTokenRepository);
        $passwordGrant->setRefreshTokenTTL($refreshTokenInterval);

        $refreshTokenGrant = new RefreshTokenGrant($this->refreshTokenRepository);
        $refreshTokenGrant->setRefreshTokenTTL($refreshTokenInterval);

        $this->authorizationServer->enableGrantType($passwordGrant, $accessTokenInterval);
        $this->authorizationServer->enableGrantType($refreshTokenGrant, $accessTokenInterval);
        $this->authorizationServer->enableGrantType(new ClientCredentialsGrant(), $accessTokenInterval);
    }

    public function validateRequest(ControllerEvent $event): void
    {
        $request = $event->getRequest();

        if (!$request->attributes->get('auth_required', true)) {
            return;
        }

        if (!$this->isRequestScoped($request, ApiContextRouteScopeDependant::class)) {