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Start with Settings → API & webhooks → Webhooks → Recent deliveries. It shows the last 100 delivery attempts, with status code, number of attempts and last error, and refreshes every 30 seconds.

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My webhook was switched off

A webhook is switched off automatically after 50 failed deliveries in a row. ✅ Solution: Fix your endpoint, then turn the webhook back on with its toggle. This resets the failure count.

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Deliveries show “pending” or “retry…”

A failed delivery is retried up to 5 times, with the wait doubling each time (about 2, 4, 8 and 16 minutes, capped at an hour). Your endpoint should respond with a 2xx status quickly.

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I’m not receiving an event

  • Check the webhook is active.
  • Check it’s subscribed to that event, or to All events (*).
  • Check the event actually happened. For example, invite.accepted only fires when LinkedIn reports the acceptance.
  • sequence.webhook is only sent when a lead reaches a Call webhook step in a sequence.
  • Some events are new. If you subscribed to a fixed list before enrollment.held, sender.running_dry, sequence.stalled, lead.unsubscribed or meeting.booked existed, add them or switch to All events (*).

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The signature check fails

  • Compute the HMAC-SHA256 over the raw request body, exactly as received, before any JSON parsing.
  • Use the webhook’s own Secret. Each webhook has a different one.
  • Compare it with the x-signature header. It is plain lowercase hex, with no sha256= prefix.
  • Compare in constant time, and check the lengths match first.
See the code samples in Outbound Webhooks.

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I can’t add a webhook

  • The URL must start with https://.
  • If you turned off All events, select at least one event.
  • Owners and Managers can manage webhooks, as can an API key with the manager role.
  • Outbound webhooks are part of the Agency Plus plan.

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I missed an event while my endpoint was down

Open Recent deliveries and click Replay on the ones you missed. A replay is a new, signed delivery carrying the same payload plus "replayed": true. See Replay a delivery.