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Developers
Most of the work in a WhatsApp integration is not the feature you were asked to build. It is sessions that drop at 2am, media that has to be fetched before a URL expires, and the same message arriving three times through three different paths. WhatSyncs handles that layer so your code stays about your product.
What the platform handles
Every one of these is straightforward to build badly and genuinely hard to build well. They are also identical for every company that attempts them.
Linking, keeping alive, detecting drops and attempting reconnects — for every number, continuously.
Message types, statuses and chats arrive in one predictable JSON shape instead of whatever the transport produced.
Realtime, reconnect replay and history are reconciled against stable message identifiers before anything reaches you.
Files are fetched, stored and exposed through authenticated, short-lived download URLs.
Signed payloads, retries with backoff, idempotency keys and a delivery log you can inspect.
Per-connection health and delivery history, so an integration failure is diagnosable rather than mysterious.
Developer experience
Send messages, retrieve conversations, download media and manage connections through a clean REST API — with signed webhooks, retries and idempotency keys so events can be processed safely.
A small service that receives webhook events, resolves the phone number to a CRM contact and writes the message as an activity. Usually a few hundred lines, and the same shape whether the CRM is HubSpot, Salesforce or in-house.
Order updates, appointment reminders and status changes sent from the business number your customers already recognise, triggered by your application rather than by a person.
Inbound messages become tickets in your helpdesk, with the connection determining the queue and the media attached to the ticket.
Conversation volume per number, response times and connection health pulled through the API into whatever your team already uses to watch the business.
Getting started
The shortest path to seeing an event land on your own endpoint.
Sign up free. No card required.
Pair a business WhatsApp account as a linked device.
Point WhatSyncs at an HTTPS endpoint you control.
Watch the signed event arrive, then build from there.
FAQ
Yes. WhatSyncs is built API-first: authenticated REST endpoints for messages, conversations, media and connections, plus signed webhooks with retries and idempotency keys so events can be processed safely.
Yes. You can send messages from any connected number with an authenticated REST call, which means your CRM, helpdesk or internal application can send from the same number your team uses.
Yes. Incoming and outgoing messages, message status updates and connection events are delivered to your endpoint as they happen. Payloads can be signed so your systems can verify that an event originated from WhatSyncs, and failed deliveries are retried.
Every message carries a stable identifier, and WhatSyncs reconciles messages seen through real-time events, reconnects and history synchronization against it. Webhook deliveries also carry an idempotency key so a retry does not create a second record in your CRM.
Yes, and it is one of the most common setups. Custom and in-house systems integrate the same way as commercial CRMs: point a webhook endpoint at WhatSyncs to receive events and call the REST API to send messages or pull conversations.
Full API access, webhooks and three connections on the Free plan.