Enviar mensaje libre

curl -X POST "https://app.beepcall.ai/api/user/whatsapp/send-freeform" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "sender_id": 12,
  "recipient_phone": "+1234567890",
  "message": "Thank you for your inquiry! Our team will review your request and get back to you within 2 hours."
}'

{
  "success": true,
  "conversation_id": 1234,
  "message_id": 567,
  "whatsapp_message_id": 890,
  "message_sid": "SMxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
  "session_status": {
    "is_open": true,
    "can_send_freeform": true,
    "requires_template": false,
    "message": "Session open (23 hr 45 min remaining). Unlimited free-form messages allowed.",
    "minutes_remaining": 1425,
    "expires_at": "2026-02-25T10:30:00+00:00"
  }
}