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List callback delivery attempts

GET
/v1/webhook-callbacks/attempts
bird webhooks callbacks attempts
Response200
{
  "data": [
    {
      "id": "msgatt_3FdaB1NkOmM6m8AxhgEYTJgqHU3",
      "event_id": "whe_01krdgeqcxet5s7t44vh8rt9mg",
      "event_type": "amb.accepted",
      "status": "delivered",
      "url": "https://example.com/webhooks",
      "failure_reason": "The endpoint's connection changed after this delivery was queued.",
      "response_status_code": 200,
      "response_body": "{\"ok\":true}",
      "response_duration_ms": 87,
      "attempted_at": "2026-05-22T11:50:38.080Z"
    }
  ],
  "next_cursor": "eyJ2IjoxLCJzIjoiXCIyMDI2LTA1LTI1VDE0OjAzOjEwWlwiIiwiaSI6IjAxOTJmM2IxLTRjN2UtN2EyYi05ZDYxLThmM2E1YzJlN2I0MCJ9",
  "prev_cursor": null,
  "refresh_cursor": "eyJ2IjoxLCJzIjoiXCIyMDI2LTA1LTI1VDE2OjQyOjAxWlwiIiwiaSI6IjAxOTJmM2IxLTllMDQtN2NkMy1iODE3LTJhNmY0ZDFjOGUwOSJ9"
}

Returns the workspace's recent delivery attempts to SMS callback URLs, newest first. Each entry is one HTTP request, so a retried event appears once per try. The url is the callback URL the request was sent to. Use this list to see what failed and why before requesting redelivery with the callback replay operation.

Cap the page with limit, and pass next_cursor from the response as starting_after to get the next, older page. Narrow the time window with the before/after timestamps; they combine with a cursor. Send only one of starting_after and ending_before; passing both returns 422.

Attempts to webhook endpoints are not included; list them with List delivery attempts.

Query Parameters

limitinteger

Maximum number of attempts to return. Defaults to 50, capped at 100.

beforestring

Only return attempts strictly before this timestamp.

afterstring

Only return attempts strictly after this timestamp.

starting_afterstring

Cursor from the next_cursor field of a previous list response. Returns items immediately after the cursor position in the current sort order.

ending_beforestring

Cursor from the prev_cursor or refresh_cursor field of a previous list response. Returns items immediately before the cursor position in the current sort order. prev_cursor returns the preceding page. refresh_cursor anchors at the first row of that response, which on a newest-first sort is how to fetch the items that have appeared since.

Response Payload

data
array of object
required

Delivery attempts, newest first.

Show child attributes
data.id
string
required

Identifier of this individual delivery attempt. Each retry is a separate attempt with its own id; use event_id to group the attempts for one event.

data.event_id
nullable string

Bird's source event ID, stable across retries of the same event. Null only for older attempts recorded before event IDs were available.

data.event_type
string
required

Webhook event type. This is an open enum, so accept unrecognized values in deliveries. Subscribing to a type outside the event catalog returns a 422.

Possible values (may grow over time): amb.accepted, amb.conversation_closed, amb.conversation_reopened, amb.conversation_started, amb.received, amb.rejected, amb.send_failed, amb.sent, amb_suppression.created, domain.failed, domain.verified, email.accepted, email.bounced, email.canceled, email.clicked, email.complained, email.deferred, email.delivered, email.list_unsubscribed, email.opened, email.out_of_band_bounce, email.processed, email.received, email.rejected, email.scheduled, email.unsubscribed, email_mailbox.message_delivered, email_mailbox.message_failed, email_mailbox.message_received, email_mailbox.message_sent, email_mailbox.suspended, email_mailbox.thread_created, email_suppression.created, preference.deleted, preference.granted, preference.revoked, sms.accepted, sms.delivered, sms.expired, sms.failed, sms.received, sms.rejected, sms.sent, sms.undelivered, sms_suppression.created, verify.attempt.delivered, verify.attempt.sent, verify.attempt.undelivered, verify.verification.created, verify.verification.failed, verify.verification.verified, voice_call.answered, voice_call.ended, voice_call.initiated, whatsapp.accepted, whatsapp.delivered, whatsapp.failed, whatsapp.group.join_request_created, whatsapp.group.join_request_revoked, whatsapp.reacted, whatsapp.read, whatsapp.received, whatsapp.rejected, whatsapp.sent, whatsapp_suppression.created

data.status
string
required

Outcome of this attempt.

  • delivered: your endpoint accepted it with a 2xx response.
  • pending: the attempt is still in flight.
  • failed: it returned a non-2xx response or no response at all. Automatic retries appear as further attempts with the same event_id, so a failed attempt is final for the event only once the retry schedule is spent. A replayed delivery takes a single attempt and is never retried.

Possible values: delivered, pending, failed

data.url
string
required

URL the request was sent to. For a webhook endpoint, its url at the time of the attempt, which can differ from the current configuration after an update. For an SMS callback, the callback URL resolved for the message's event.

data.failure_reason
string

Why the attempt failed when no HTTP response explains it: a failure before any request was sent, such as a connector body that could not be rendered, or a TLS failure, such as an endpoint certificate that could not be verified. Absent for other attempts.

data.response_status_code
nullable integer
required

HTTP status returned by the receiver. Null when no response was received (timeout, connection error, DNS failure).

data.response_body
string

Response body your endpoint returned, which may be truncated. Omitted when no body was returned.

data.response_duration_ms
integer
required

Round-trip duration in milliseconds.

data.attempted_at
string
required

When this attempt was made. Attempts are listed newest first by this timestamp, and the list's before/after parameters bound it.

next_cursor
nullable string
required

Cursor for the next page. Pass back as starting_after to advance forward. null when no next page exists.

prev_cursor
nullable string
required

Cursor for the previous page. Pass back as ending_before to step backward. null when no previous page exists.

refresh_cursor
nullable string
required

Refresh anchor, the first row of this response. Pass back as ending_before to fetch what precedes it in the current sort order. On a newest-first sort those are the items that have appeared since; on any other sort they are the items that sort earlier, so refreshing such a list means re-fetching it instead. Non-null whenever data is non-empty; null only on an empty page. Distinct from prev_cursor.

Related resources

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