curl --request GET \
  --url https://api.example.com/brokerage-firms/brokers/{brokerUserId}

{
  "firstName": "<string>",
  "lastName": "<string>",
  "userId": "<string>",
  "brokerageFirmId": "<string>",
  "productIds": [
    "<string>"
  ],
  "email": "<string>",
  "brokerRole": "<string>"
}