When your SaaS product connects to the third-party tools your customers already use, such as a CRM, a calendar, or a ticketing system, enterprise deals often require that data move between the two within seconds. If a deal closes in HubSpot, the customer expects your product to reflect it before the next polling cycle runs. Polling every API on a tight schedule is slow and expensive at scale. Webhooks reduce that delay and cost, but they can arrive late, more than once, or not at all. Webhook...