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Add acknowledge to a POST /notifications body and PushWard sends the notification again every repeat_seconds, until someone acknowledges it on one of their devices, until expire_seconds have passed, or until you cancel it. It is for the alerts where one buzz in a pocket is not enough: a water leak, a server that stopped answering, the garage door open at midnight.

curl -X POST https://api.pushward.app/notifications \
  -H "Authorization: Bearer hlk_YOUR_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "title": "Water leak",
    "body": "Sensor under the kitchen sink",
    "level": "time-sensitive",
    "source": "home",
    "acknowledge": { "repeat_seconds": 120, "expire_seconds": 3600 },
    "tags": ["leak"],
    "callback_url": "https://hooks.example.com/pushward"
  }'

This one has no button of its own that PushWard records, so the server adds an Acknowledge button. The response shows it, and carries the notification's receipt:

{
  "id": 4242,
  "title": "Water leak",
  "body": "Sensor under the kitchen sink",
  "level": "time-sensitive",
  "source": "home",
  "actions": [
    { "id": "pw_ack", "title": "Acknowledge", "icon": "checkmark.circle" }
  ],
  "answerable": true,
  "pushed": true,
  "created_at": "2026-10-20T07:00:00Z",
  "delivery": "all",
  "receipt": {
    "notification_id": 4242,
    "status": "active",
    "repeat_seconds": 120,
    "expires_at": "2026-10-20T08:00:00Z",
    "repeats_sent": 0,
    "last_delivered_at": "2026-10-20T07:00:00Z",
    "tags": ["leak"],
    "callback": { "status": "pending", "attempts": 0 },
    "created_at": "2026-10-20T07:00:00Z"
  }
}

The acknowledge object

"acknowledge": {} takes all three defaults: once a minute, for an hour.

• A repeat is the same notification again, with the same text, level, actions and media. Each repeat alerts again but replaces the previous one in Notification Center, so they do not stack up. Set level to time-sensitive if it has to get through a Focus.
• At most 50 repeats are sent. Every 30 seconds for 3 hours would be 360, so a short repeat_seconds with a long expire_seconds goes quiet after the 50th and waits out the rest of its time.
• Repeats are free. The first send counts toward your notification quota like any other notification; the repeats do not.
• Each repeat goes to the devices the account has at that moment, so a phone signed in halfway through gets the next one. For an organization, repeats go to the members who got the first send, with their current mute and routing settings.
• push: false and level: passive cannot be acknowledged; both are a 400.
• Up to 25 acknowledged notifications can be active per account at once, and an organization's sends count against the organization. One more is a 409 with notification_receipt.limit_exceeded.
• A new acknowledged notification with the same collapse_id, sent with the same integration key, replaces one that is still repeating: the old receipt is canceled with cancel_reason superseded before the 25 are counted. Useful for an alert that changes while it is open (a temperature still climbing).
• Scheduled notifications take acknowledge, tags and callback_url too, and start repeating when they go out. If 25 are already active at that moment, that send goes out once as a plain notification, without repeats or a receipt (GET /notifications/receipts/{id} answers 404 for it).

Which taps count

Any tap that PushWard records as an answer acknowledges the notification: an action without a url and without foreground, including a typed reply. When none of your actions is like that, the server puts its own button first: { "id": "pw_ack", "title": "<action_title>", "icon": "checkmark.circle" }. A button that opens a URL or the app does not count, so this works:

"actions": [
  { "id": "fixing", "title": "On it", "icon": "wrench" },
  { "id": "dashboard", "title": "Open Grafana", "url": "https://grafana.example.com/d/water" }
],
"acknowledge": {}

Here On it acknowledges and no pw_ack is added. The id pw_ack is reserved for the server (400 if you use it), and ten actions with none of them answerable leave no room for the extra button (400). The answer is also readable from GET /notifications/answers/{id} as usual.

Tags and callback_url

Both sit at the top level of the request, next to acknowledge, and both need it. tags is a list of up to 10 labels, each 1 to 64 printable ASCII characters without spaces, used to cancel a group of alerts at once. Duplicates are dropped. callback_url is an https URL that gets a signed POST when the notification is acknowledged or expires; see Callbacks.

The receipt

The receipt's id is the notification id, the id from POST /notifications, or the notification_id of a sent scheduled notification. Fields that do not apply yet are left out.

Finished receipts stay readable for 7 days, then they are deleted.

Reading and canceling

curl "https://api.pushward.app/notifications/receipts/4242?wait=25" \
  -H "Authorization: Bearer hlk_YOUR_TOKEN"

{
  "notification_id": 4242,
  "status": "acknowledged",
  "repeat_seconds": 120,
  "expires_at": "2026-10-20T08:00:00Z",
  "repeats_sent": 3,
  "last_delivered_at": "2026-10-20T07:06:00Z",
  "acknowledged_at": "2026-10-20T07:07:12Z",
  "acknowledged_by": "7d1c5e2a-3f4b-4c8e-9a61-2b0f6d8e4c13",
  "acknowledged_by_device": "Kitchen iPad",
  "action_id": "pw_ack",
  "tags": ["leak"],
  "callback": { "status": "delivered", "attempts": 1, "delivered_at": "2026-10-20T07:07:13Z", "last_status_code": 200 },
  "created_at": "2026-10-20T07:00:00Z"
}

A long-poll that runs out is not an error: it returns the receipt, still active, and you ask again. Open ?wait requests are shared with answer and activity reads, at most 4 per account; one more is a 429 answer_wait.limit_exceeded.

Canceling

# one notification
curl -X POST https://api.pushward.app/notifications/receipts/4242/cancel \
  -H "Authorization: Bearer hlk_YOUR_TOKEN"

# everything still repeating with the tag "leak"
curl -X POST https://api.pushward.app/notifications/receipts/cancel \
  -H "Authorization: Bearer hlk_YOUR_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"tag": "leak"}'

Canceling only stops the repeats; it is not a recall. Banners already delivered stay where they are, the notification stays in the app's history, and no callback is sent for a canceled receipt. Call it from the thing that fixed the problem: the leak sensor reading dry again, the health check passing.

An integration key reads and cancels only the receipts of notifications it sent itself. Another key's notification id is a 404, and canceling by tag skips the other keys' alerts with the same tag. Revoking a key, letting it expire or taking away its notifications access cancels its active receipts with key_revoked.

Callbacks

With a callback_url, PushWard sends one POST when the receipt finishes: notification.acknowledged or notification.expired. A canceled receipt sends nothing. Delivery is at least once, so the same event can arrive twice; deduplicate on webhook-id.

POST /pushward HTTP/1.1
Host: hooks.example.com
Content-Type: application/json
User-Agent: PushWard-Webhook/1
webhook-id: pwr_4242
webhook-timestamp: 1792480033
webhook-signature: v1,qERR29JWI+VB49/fNoMAEHY3LArHdrYidBMh5V7HXWc=

{"type":"notification.acknowledged","timestamp":"2026-10-20T07:07:12Z","data":{"notification_id":4242,"status":"acknowledged","repeat_seconds":120,"expires_at":"2026-10-20T08:00:00Z","repeats_sent":3,"last_delivered_at":"2026-10-20T07:06:00Z","acknowledged_at":"2026-10-20T07:07:12Z","acknowledged_by":"7d1c5e2a-3f4b-4c8e-9a61-2b0f6d8e4c13","acknowledged_by_device":"Kitchen iPad","action_id":"pw_ack","tags":["leak"],"created_at":"2026-10-20T07:00:00Z"}}

In the body, type is the event, timestamp is when the receipt finished (the same on every retry), and data is the receipt as GET /notifications/receipts/{id} returns it, without callback.

Delivery and retries

• Any 2xx counts as delivered. A 410 fails it at once (the endpoint is gone). Any other status, a timeout or a connection error is retried 1, 2, 4, 8, 16 and 32 minutes later, and after that the callback is failed. Redirects are not followed; a 3xx counts as a failed attempt.
• Each attempt gets 10 seconds in all (5 to connect, 5 for TLS). PushWard reads at most 64 KB of your response body and does nothing with it, so answer 204 quickly and do the work afterwards.
• The URL has to be https, with a host, no user name or password, and at most 2048 characters. It cannot point at a private place: localhost, .local, .internal, .svc, .cluster.local or a private IP address are refused when you send, and a name that resolves to a private, loopback, link-local or CGNAT address fails the callback when PushWard connects. A Home Assistant on your LAN is out of reach; use its Home Assistant Cloud webhook URL.
• A revoked or expired key leaves nothing to sign with: its pending callbacks fail without a request.

Verifying the signature

There is no secret to create or rotate. It is derived from the integration key that sent the notification:

key_hash = SHA-256(integration key as UTF-8)                 # 32 raw bytes
secret   = HMAC-SHA256(key = key_hash, message = "pushward/callback/v1")
whsec    = "whsec_" + base64(secret)

pushward receipt secret prints the whsec_ form for the CLI's configured key, or for another one with --key -, which reads it from stdin and keeps it out of your shell history. The scheme is Standard Webhooks, so any of its libraries verifies these requests once you give it that whsec_ secret. Rolling the key changes the secret for every callback delivered after the roll, including retries of events from before it.

op read op://Private/pushward-alerts/credential | pushward receipt secret --key -

Without a library, verify the signature over the raw body, before parsing it, and reject timestamps more than five minutes off:

import base64, hashlib, hmac, time


def callback_secret(integration_key: str) -> bytes:
    key_hash = hashlib.sha256(integration_key.encode()).digest()
    return hmac.new(key_hash, b"pushward/callback/v1", hashlib.sha256).digest()


def verify(headers, body: bytes, integration_key: str, tolerance: int = 300) -> bool:
    """headers: the request headers (any mapping); body: the raw request body."""
    msg_id = headers.get("webhook-id", "")
    ts = headers.get("webhook-timestamp", "")
    if not (ts.isascii() and ts.isdigit()) or abs(time.time() - int(ts)) > tolerance:
        return False
    signed = f"{msg_id}.{ts}.".encode() + body
    mac = hmac.new(callback_secret(integration_key), signed, hashlib.sha256)
    expected = base64.b64encode(mac.digest()).decode()
    # The header can carry several space-separated signatures.
    for sig in headers.get("webhook-signature", "").split():
        version, _, value = sig.partition(",")
        if version == "v1" and hmac.compare_digest(value, expected):
            return True
    return False

import { createHash, createHmac, timingSafeEqual } from 'node:crypto';

export function callbackSecret(integrationKey) {
  const keyHash = createHash('sha256').update(integrationKey).digest();
  return createHmac('sha256', keyHash).update('pushward/callback/v1').digest();
}

// headers: lower-case names, as node:http gives them. rawBody: the request
// body exactly as received (a Buffer), before any JSON parsing.
export function verify(headers, rawBody, integrationKey, toleranceSeconds = 300) {
  const id = headers['webhook-id'] ?? '';
  const ts = headers['webhook-timestamp'] ?? '';
  if (!/^\d+$/.test(ts)) return false;
  if (Math.abs(Date.now() / 1000 - Number(ts)) > toleranceSeconds) return false;
  const expected = createHmac('sha256', callbackSecret(integrationKey))
    .update(`${id}.${ts}.`)
    .update(rawBody)
    .digest();
  // The header can carry several space-separated signatures.
  return (headers['webhook-signature'] ?? '').split(' ').some((sig) => {
    const [version, value = ''] = sig.split(',');
    const got = Buffer.from(value, 'base64');
    return version === 'v1' && got.length === expected.length && timingSafeEqual(got, expected);
  });
}

package callback

import (
	"crypto/hmac"
	"crypto/sha256"
	"encoding/base64"
	"errors"
	"io"
	"math"
	"net/http"
	"strconv"
	"strings"
	"time"
)

// Secret derives the signing secret from the integration key that sends.
func Secret(integrationKey string) []byte {
	sum := sha256.Sum256([]byte(integrationKey))
	mac := hmac.New(sha256.New, sum[:])
	mac.Write([]byte("pushward/callback/v1"))
	return mac.Sum(nil)
}

// Verify checks a callback request and returns its body.
func Verify(r *http.Request, integrationKey string) ([]byte, error) {
	body, err := io.ReadAll(io.LimitReader(r.Body, 1<<20))
	if err != nil {
		return nil, err
	}
	id := r.Header.Get("webhook-id")
	ts := r.Header.Get("webhook-timestamp")
	sec, err := strconv.ParseInt(ts, 10, 64)
	if err != nil || math.Abs(time.Since(time.Unix(sec, 0)).Seconds()) > 300 {
		return nil, errors.New("timestamp outside tolerance")
	}
	mac := hmac.New(sha256.New, Secret(integrationKey))
	mac.Write([]byte(id + "." + ts + "."))
	mac.Write(body)
	want := mac.Sum(nil)
	// The header may carry several space-separated signatures.
	for _, sig := range strings.Fields(r.Header.Get("webhook-signature")) {
		v, b64, ok := strings.Cut(sig, ",")
		if !ok || v != "v1" {
			continue
		}
		got, err := base64.StdEncoding.DecodeString(b64)
		if err == nil && hmac.Equal(got, want) {
			return body, nil
		}
	}
	return nil, errors.New("signature mismatch")
}

/e2e/callback-vectors-v1.json has two integration keys with their derived secrets and signed sample requests to test your code against. The request above is signed with the first of those keys.

From the CLI, MCP and integrations

Acknowledged alerts need CLI 1.4.0, pushward-mcp 1.16.0, the Home Assistant integration 0.51.0, the Grafana plugin 0.10.0 or the Unraid plugin 2026.10.08 or later; on the Relay they need ?ack=1. The app shows them on every version; see Older app versions for what 1.17.0 adds.

The CLI has --ack on notify and schedule create, with --ack-repeat (30s to 1h), --ack-expire (1m to 3h) and --ack-title, which imply it, plus --tag (repeatable) and --callback-url. notify --ack --wait blocks until it is acknowledged. The GitHub Action takes the same as inputs: ack, ack-repeat, ack-expire, ack-title, tags and callback-url.

pushward notify --title "db-1 down" --body "Primary unreachable" \
  --level time-sensitive --ack --ack-repeat 2m --tag db-1
pushward receipt 4242 --wait 10m      # exit 7 if it expires, or 10m pass, first
pushward receipt cancel --tag db-1    # db-1 is back: stop repeating

The MCP server passes acknowledge, tags and callback_url through create_notification and create_scheduled_notification, and adds get_notification_receipt, wait_for_ack (waits up to 10 minutes and reports how it ended), cancel_notification_receipt and cancel_notification_receipts_by_tag. Give acknowledge at least one field there, such as {"repeat_seconds": 60}: the tools drop an empty object, and tags or callback_url without it are refused.

In Home Assistant, pushward.send_notification takes acknowledge (true for the defaults, or the object), tags and callback_url, and returns the receipt when you ask for a response. pushward.cancel_notifications stops one by notification_id or all of them with a tag.

The Grafana app plugin has a Repeat until acknowledged switch under Also send a push notification, with the repeat interval and the expiry next to it (300 and 3600 seconds by default). The firing push repeats, and the resolve stops the repeats before the resolved push goes out.

The Unraid plugin has the same setting under Settings → PushWard. Only notifications that arrive as Unraid alerts repeat, tagged unraid-<server name>, and a later notice for the same event that is not an alert stops them.

On the Relay, add ack=1 to the webhook URL, with ack_repeat and ack_expire for the timing. Alerts from Grafana, Uptime Kuma, Gatus, Komodo and the universal webhook then repeat until acknowledged, and the resolve webhook stops them where the service sends one. TrueNAS cannot send query parameters, so its API URL is https://relay.pushward.app/truenas/ack instead.

The Grafana plugin, the Unraid plugin and the relay all send the alert once without repeats, rather than lose it, when the account already has 25 active or the server refuses the acknowledge.

Older app versions

The repeats and the Acknowledge button work on every version of the app, because the button is an ordinary action that PushWard records. PushWard 1.17.0 adds two things. When someone acknowledges, the notification is cleared from every iPhone, iPad and Mac that got it; older versions leave it there until it is dismissed by hand. And only 1.17.0 reports which device the tap came from, so acknowledged_by_device stays empty for taps on older versions.

Errors