Webhooks work on a simple principle: when something happens in System A (a form is submitted, a deal stage changes, a payment is processed), System A sends an HTTP POST request containing event data to a URL you specify in System B. System B receives the data and processes it immediately.
The key difference between webhooks and API calls is directionality. With an API, you poll the source system periodically to check for new data ("Has anything changed since I last checked?"). With a webhook, the source system tells you when something changes ("Something just happened, here's the data"). Webhooks are more efficient and more timely.
Common webhook use cases in MOps include real-time lead routing (form submission triggers a webhook that routes the lead to the right rep instantly), event-driven enrichment (new record created triggers enrichment lookup), notification workflows (high-value actions trigger Slack alerts), cross-system sync (payment in billing system triggers customer status update in CRM), and custom scoring updates (product usage events update scores in real time).
Most modern SaaS tools support outgoing webhooks. Your MAP, CRM, form tools, payment systems, and analytics platforms likely offer webhook configuration. The receiving end can be an iPaaS tool (Zapier, Workato), a custom endpoint (AWS Lambda, Cloudflare Worker), or another application that accepts incoming webhooks.
Webhook reliability is an important consideration. Webhooks can fail if the receiving endpoint is down, the payload format changes, or rate limits are exceeded. Implement retry logic, logging, and alerting so you know when a webhook delivery fails. Most webhook senders retry failed deliveries a few times before giving up, but relying on this without monitoring is risky.