Webhooks

Deliveries and retries

Every dispatch is recorded as a delivery you can inspect, retry, or replay. This is how you diagnose a receiver that stopped accepting events — and how you recover the ones it missed.

On this page

Delivery lifecycle
Inspecting deliveries
Recovering
Testing a receiver

Delivery lifecycle

Repeated delivery failures pause a subscription automatically; paused subscriptions dead-letter incoming events until resumed. Use the delivery, retry, and replay endpoints to inspect and recover.

A delivery moves through four states: pending while queued, delivered once the target accepts it, failed after an attempt that did not succeed, and dead_lettered once retries are exhausted or the subscription is paused.

A paused subscription still costs you events

Repeated failures pause a subscription automatically. While it is paused, matching events are dead-lettered rather than delivered — they are recoverable with a bulk replay, but only if you notice. Watch the counters below.

Inspecting deliveries

Delivery history carries the attempt count, the last HTTP response code the target returned, and the exact payload that was sent — enough to tell a receiver bug from a network problem. It is also where you read a payload that arrived truncated.

Field	Type	Required	Description
`id`	string	Optional	Delivery id — a UUID, and the value sent as the `X-Inkfree-Delivery` header.
`subscriptionId`	string	Optional	Subscription this delivery belongs to.
`eventId`	string	Optional	Id of the event being delivered.
`eventType`	string	Optional	Event type, e.g. `envelope.completed`, or `inkfree.test` for test dispatches.
`payload`	string	Optional	Raw JSON body sent to the target URL. Read the full payload here when a delivery arrived truncated.
`status`	string	Optional	Current state of the delivery.`pendingdeliveredfaileddead_lettered`
`attempts`	integer	Optional	Number of attempts made so far.
`lastResponseCode`	integer	Optional	HTTP status returned by the target on the last attempt.
`nextAttemptAt`	string	Optional	When the next retry is scheduled, formatted `MM/dd/yyyy HH:mm:ss`.
`lastAttemptAt`	string	Optional	When the last attempt was made, formatted `MM/dd/yyyy HH:mm:ss`.
`version`	string	Optional	Payload schema version.

curl

curl "https://api-uat.softsages.com/core/api/v1/inkfree/webhooks/whk_123/deliveries" \
  -H "X-API-Key: sk_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

For a quick health check across all subscriptions, read the counters instead:

curl

curl "https://api-uat.softsages.com/core/api/v1/inkfree/webhooks/metrics" \
  -H "X-API-Key: sk_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

200 response

{
  "account": "acme",
  "app": "inkfree",
  "by_subscription": {
    "whk_123": {
      "pending": 0,
      "delivered": 412,
      "failed": 3,
      "dead_lettered": 1
    }
  }
}

Recovering

Three endpoints replay events, and they differ in what payload they send. Retry and bulk replay reuse the stored payload; the arbitrary-payload replay sends exactly the body you pass, which is what you want when reproducing a specific case against a receiver under test.

A retry gets a new delivery id

Retrying creates a new delivery record rather than mutating the original, so your receiver sees an X-Inkfree-Deliveryit has not seen before. Deduplicate on the event's own id if you need to suppress the repeat — see Deduplication.

Bulk replay is the recovery path after an outage on your side. It defaults to dead_lettered deliveries from the last 24 hours, clamps since_hours to 1–720, and replays at most 500 deliveries per call — run it repeatedly to work through a larger backlog.

curl

curl -X POST "https://api-uat.softsages.com/core/api/v1/inkfree/webhooks/whk_123/replay/bulk" \
  -H "X-API-Key: sk_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{
  "status": "dead_lettered",
  "since_hours": 48
}'

200 response

{
  "subscription_id": "whk_123",
  "status_filter": "dead_lettered",
  "since": "2026-01-13T10:30:00",
  "replayed": 17
}

Testing a receiver

Send a synthetic inkfree.test event. It creates a real delivery record and exercises the full signing and delivery path, so it is the reliable way to confirm your signature verification works before going live.

curl

curl -X POST "https://api-uat.softsages.com/core/api/v1/inkfree/webhooks/whk_123/test" \
  -H "X-API-Key: sk_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

200 response

{
  "delivery_id": "8f14e45f-ea6d-4b1f-9b3a-1c2d3e4f5a6b",
  "message": "Test webhook queued."
}

Full reference for all of these: Webhook operations.