Developers

One API for every channel — call included

Send messages, enrol contacts into flows and receive signed webhooks across WhatsApp, Instagram, Messenger, email and the phone. REST, predictable, documented.

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REST API
Predictable resources, cursor pagination and idempotency keys.
Signed webhooks
Real-time events with HMAC signatures and automatic retries.
Free sandbox
A full test workspace with seeded data and throwaway numbers.
REQUEST
curl https://api.flowsdesigner.com/v1/messages \
  -H "Authorization: Bearer fd_live_sk_8c2f" \
  -d channel="whatsapp" \
  -d to="+971506953506" \
  -d template="appointment_reminder"
RESPONSE
{
  "id": "msg_9Kd2",
  "status": "queued",
  "channel": "whatsapp",
  "to": "+971506953506"
}
Endpoints

A few of the resources

POST/v1/messagesSend a message on any channel
GET/v1/conversationsList and filter conversations
POST/v1/contactsCreate or upsert a contact
GET/v1/contacts/{id}Fetch a contact with history
POST/v1/flows/{id}/triggerEnrol a contact into a flow
POST/v1/broadcastsSchedule a template broadcast

Build on it in an afternoon.

Spin up a free sandbox with seeded data and a throwaway number — no card.

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