Svix is an enterprise-ready webhooks sending service that allows users to build a secure, reliable, and scalable webhook platform in minutes. Webhooks were created for asynchronous server-to-server communications, but they pose challenges when the recipient endpoint is not internet-facing or available. Svix provides durable webhook deliveries behind firewalls and to unreliable endpoints using its Ingest and Polling Endpoints. This approach solves the problems of making endpoints internet-facing and dealing with server downtime, enabling reliable webhook delivery in various scenarios.