Symfony

composer require senderkit/senderkit-symfony

return [
    // …
    SenderKit\Symfony\SenderKitBundle::class => ['all' => true],
];

senderkit:
    api_key: '%env(SENDERKIT_API_KEY)%'
    webhook_secret: '%env(SENDERKIT_WEBHOOK_SECRET)%'  # optional; required for webhook verification

SENDERKIT_API_KEY=sk_live_…
SENDERKIT_WEBHOOK_SECRET=whsec_…

use SenderKit\Client;
use SenderKit\Request\TemplateSend;

class NotificationService
{
    public function __construct(private readonly Client $senderkit) {}

    public function welcome(string $email, string $name): void
    {
        $this->senderkit->send(new TemplateSend(
            template: 'welcome',
            to: $email,
            vars: ['name' => $name],
        ));
    }
}

use SenderKit\Symfony\Webhook\RequestVerifier;
use SenderKit\Exception\SignatureVerificationException;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;

class WebhookController
{
    public function __construct(private readonly RequestVerifier $verifier) {}

    #[Route('/webhooks/senderkit', methods: ['POST'])]
    public function handle(Request $request): Response
    {
        try {
            $event = $this->verifier->verify($request);
        } catch (SignatureVerificationException $e) {
            return new Response('Bad signature', 400);
        }

        match ($event->type) {
            'message.delivered' => $this->handleDelivered($event->payload),
            'message.failed'    => $this->handleFailed($event->payload),
            default             => null,
        };

        return new Response('', 204);
    }
}