Send and Receive SMS

# Register the number (once)
curl -X POST https://api-sandbox.featherhq.com/v1/communication/phone-numbers \
  -H "x-api-key: <your_api_key>" \
  -H "Content-Type: application/json" \
  -d '{ "phone_e164": "+15555550100", "vendor": "twilio", "vendor_mode": "byo", "capabilities": ["sms"] }'

# Bind an assistant so inbound texts route to it
curl -X POST \
  https://api-sandbox.featherhq.com/v1/communication/phone-numbers/<phone_number_id>/channels \
  -H "x-api-key: <your_api_key>" \
  -H "Content-Type: application/json" \
  -d '{ "channel_type": "sms", "agent_id": "<agent_id>" }'

curl -X POST https://api-sandbox.featherhq.com/v1/sms/send \
  -H "x-api-key: <your_api_key>" \
  -H "Content-Type: application/json" \
  -d '{
    "from_number": "+15555550100",
    "to": "+15555550123",
    "body": "Your order has shipped and will arrive Friday.",
    "agent_id": "<agent_id>",
    "idempotency_key": "order-12345-shipped"
  }'

curl -X PUT https://api-sandbox.featherhq.com/v1/sms/settings \
  -H "x-api-key: <your_api_key>" \
  -H "Content-Type: application/json" \
  -d '{ "allowed_countries": ["US", "CA"], "max_message_length": 480 }'