Voice API for service businesses

Add AI receptionist to your app in one API call

Name: Sowa Answers
Brand: Sowa

Provision numbers, receive call intents and transcripts via webhooks. Built for plumbers, contractors, clinics. 100 free calls/month. Canadian-built, PIPEDA compliant.

Get API access API docs Pricing

First webhook in 5 minutes · Canadian-built

Provision in one call

POST to provision a number. We handle routing and AI answering.

Webhooks for intents

Receive call summary, urgency, transcript. Integrate with CRM, Zapier, n8n.

100 free calls/mo

Canadian-built. PIPEDA compliant.

Client webhooks

Sowa Answers subscribers can configure a webhook URL in their dashboard (or via Admin). When a call is answered and analyzed, we send a POST request to your URL with the event payload.

Event: `call.completed`

Sent when the AI receptionist has finished a call and post-call analysis is complete.

Payload (JSON)

{
  "event": "call.completed",
  "id": "call_xxx",
  "phone_number": "+1234567890",
  "timestamp": "2026-03-01T12:00:00.000Z",
  "duration_seconds": 45,
  "intent": {
    "summary": "Customer needs same-day plumbing repair",
    "urgency": "high",
    "requested_action": "schedule_visit",
    "extracted_data": {}
  },
  "transcript": "Full transcript..."
}

Fields

event — Always call.completed
id — Unique call identifier
phone_number— Caller's phone (E.164)
timestamp — ISO 8601
duration_seconds — Call length
intent — summary, urgency, requested_action, extracted_data
transcript — Full transcript

We include X-Sowa-Signature (HMAC-SHA256) for verification.

Requirements

Webhook URL must use HTTPS
Your endpoint should respond with 200 within 10 seconds
Configure in Dashboard → Systems (contact support if you need Admin access)

Sowa Flow — Invoice API

Generate professional PDF invoices with one API call. Auth: Bearer API key (lsk_...) or session cookie. Free tier: 10 invoices/month. Paid: 100/month.

Endpoint: `POST /api/flow/invoices`

Request body (JSON)

{
  "from": { "name": "Your Business", "address": "...", "email": "..." },
  "to": { "name": "Client Name", "address": "...", "email": "..." },
  "items": [{ "description": "Service", "quantity": 1, "rate": 150 }],
  "currency": "CAD",
  "dueDate": "2026-04-01",
  "invoiceNumber": "INV-001"
}

Response

200 — PDF binary. 400 validation error. 401 unauthorized. 429 usage limit exceeded.

Sowa Flow · Dashboard Invoice Builder

Use cases

Create a CRM lead when a call is handled
Log calls to your internal system
Trigger Zapier/Make/n8n workflows
Sync with your calendar or booking tool

Get API access Book a demo· Sowa Answers · Sowa Flow · Compliance · Home