For developers

WhatsApp in your stack, in an afternoon

A small, predictable REST API for sending and syncing, and signed webhooks for everything that happens on your number.

# Send an approved template from your backend
curl -X POST https://wa.procellari.com/api/v1/messages \
  -H "Authorization: Bearer $PROCELLARI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to":"919812345678","template":{"name":"order_update","variables":["PC-4821","shipped"]}}'

Built to be boring

Production details, handled

Revocable API keys

Create a key per integration, see when they were last used, revoke instantly. Only a hash is stored.

Signed webhooks

Every delivery carries an HMAC-SHA256 signature and timestamp so you can reject forgeries and replays.

Retries with backoff

Failed webhook deliveries retry with exponential backoff for about an hour.

Rate-limit aware

API keys are rate limited and sends are paced per number to stay inside Meta's throughput limits.

Endpoints

POST	`/api/v1/messages` Send text or an approved template to a contact
GET	`/api/v1/messages?id=…` Look up a message's delivery status
POST	`/api/v1/contacts` Create or update a contact by WhatsApp number
GET	`/api/v1/contacts` List contacts with tags and attributes (cursor paginated)

Webhook events

message.received

A customer sent you a message

message.status

A message was sent, delivered, read or failed

contact.created

A new contact was added

broadcast.completed

A campaign finished sending

order.updated

A WhatsApp order was placed or paid

Build on WhatsApp with Procellari

Create a free workspace, generate an API key under Settings → API keys, and send your first message.

Create your workspace Talk to us on WhatsApp

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