contact.consent

.md

Event POST <your callback URL>

A contact opted in or out of a category - by replying STOP or START (source: keyword), or through the API. After a STOP, business-initiated marketing and notification templates to them are refused; update your own records too.

Verify every callback

Check X-PaalChat-Signature on the raw body, reject timestamps older than 5 minutes, and de-duplicate on X-PaalChat-Delivery. Answer 2xx within 10 seconds. See Webhooks and callbacks.

Headers

X-PaalChat-Event string

X-PaalChat-Delivery string

Unique per event (equals body id). De-duplicate on it.

Format uuid.

X-PaalChat-Signature string

t=<unix seconds>,v1=<hex HMAC-SHA256(secret, "<t>.<raw body>")>. Reject if invalid or older than 300 seconds.

Pattern ^t=\d+,v1=[a-f0-9]{64}$.

Body

id string

Equals X-PaalChat-Delivery.

Format uuid.

sandbox boolean

true for sandbox businesses (test keys) - nothing reached WhatsApp.

event any

Always contact.consent.

occurred_at string

Format date-time.

business object

external_id string business.external_id

data object

contact_id integer data.contact_id

contact_external_id string | null data.contact_external_id

phone string | null data.phone

category string data.category

One of: marketing, notifications, transactional.

status string data.status

One of: granted, revoked.

source string data.source

keyword (the contact replied STOP or START), api, inbox, or the source you sent.

// routes/api.php: Route::post('/paalchat/callback', PaalChatCallbackController::class); public function __invoke(Request $request) { $header = (string) $request->header('X-PaalChat-Signature'); $raw = $request->getContent(); if (! preg_match('/^t=(\d+),v1=([a-f0-9]{64})$/', $header, $m) || abs(time() - (int) $m[1]) > 300 || ! hash_equals(hash_hmac('sha256', $m[1].'.'.$raw, config('services.paalchat.callback_secret')), $m[2])) { abort(401); } // Process each delivery once. if (! Cache::add('paalchat:'.$request->header('X-PaalChat-Delivery'), true, now()->addDays(2))) { return response()->noContent(); } $event = json_decode($raw, true); if ($event['event'] === 'contact.consent') { Guardian::where('phone', $event['data']['phone'])->update(['whatsapp_'.$event['data']['category'] => $event['data']['status'] === 'granted']); } return response()->noContent(); }

{ "id": "6a7b8c9d-0e1f-4a2b-9c3d-4e5f6a7b8c9d", "event": "contact.consent", "occurred_at": "2026-10-02T19:04:11+00:00", "business": {"external_id": "presec"}, "sandbox": false, "data": { "contact_id": 41, "contact_external_id": "parent-77", "phone": "233241234567", "category": "marketing", "status": "revoked", "source": "keyword" } }