curl --request GET \
  --url https://api.buildwithchirp.com/v1/organization/billing/summary \
  --header 'Authorization: Bearer <token>'

{
  "total_cost": 5.43,
  "currency": "USD",
  "period": {
    "start": "<string>",
    "end": "<string>"
  },
  "by_product": {
    "messaging": 123,
    "sip-trunking": 123,
    "webrtc": 123,
    "recording": 123,
    "media-storage": 123,
    "whatsapp": 123,
    "phone-numbers": 123
  },
  "by_channel": {
    "sms": 123,
    "mms": 123,
    "whatsapp": 123,
    "voice": 123,
    "other": 123
  },
  "by_direction": {
    "inbound": 123,
    "outbound": 123
  },
  "record_count": 123
}