Voice call API with call and keypress webhooks

POST {API_BASE_URL}/voice/calls
Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

{
  "to": "+9198XXXXXX21",
  "tts": {
    "language": "hi",
    "text": "नमस्ते {name} जी। आपकी EMI {amount} रुपये {due_date} को है। भुगतान हो गया हो तो 1 दबाएँ, इस हफ़्ते करेंगे तो 2 दबाएँ।",
    "variables": { "name": "राहुल", "amount": "4,250", "due_date": "10 दिसंबर" }
  },
  "keys": { "1": "already_paid", "2": "will_pay_this_week", "3": "callback" },
  "retries": { "max_attempts": 3, "gap_minutes": 30 },
  "reference": "loan-88213",
  "webhook_url": "https://your-crm.example.com/msgclub/voice"
}

POST {API_BASE_URL}/voice/calls
Authorization: Bearer YOUR_API_KEY

{
  "to": ["+9198XXXXXX21", "+9194XXXXXX87"],
  "voice_draft_id": "vd_term_fee_reminder",
  "keys": { "1": "acknowledged", "9": "repeat" },
  "schedule_at": "2026-12-05T11:00:00+05:30",
  "webhook_url": "https://your-crm.example.com/msgclub/voice"
}

<?php
$payload = [
  'to' => '+9198XXXXXX21',
  'voice_draft_id' => 'vd_term_fee_reminder',
  'keys' => ['1' => 'acknowledged'],
  'webhook_url' => 'https://your-crm.example.com/msgclub/voice',
];
$ch = curl_init('{API_BASE_URL}/voice/calls');
curl_setopt_array($ch, [
  CURLOPT_POST => true,
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_HTTPHEADER => ['Authorization: Bearer YOUR_API_KEY', 'Content-Type: application/json'],
  CURLOPT_POSTFIELDS => json_encode($payload),
]);
$response = curl_exec($ch);
curl_close($ch);