A user-defined HTTP callback that delivers real-time data to an endpoint. In practice, a trading system configures a webhook URL (for Slack, Discord, or other services) and sends an HTTP POST to it when an event occurs. For instance, Slack’s incoming webhook accepts JSON posts to display messages, and Discord’s webhook similarly accepts POSTs to publish alerts. Webhooks are popular for alert delivery because they push information instantly (rather than waiting for the client to poll). In automated trading, webhooks enable 3rd-party integrations: e.g., a Trade Trigger in TradingView can POST to a webhook that forwards the alert to Slack or Discord.

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