curl --request POST \
  --url https://app.useboom.ai/api/v1/cdp/people \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "externalId": "user_123",
  "attributes": {
    "email": "a@b.com",
    "plan": "pro",
    "mrr": 49
  }
}
'

{
  "externalId": "user_123",
  "created": true
}