curl --request POST \
  --url https://api.sternrockcapital.com/user/register \
  --header 'Content-Type: application/json' \
  --data '{
  "email": "<string>",
  "password": "<string>",
  "username": "<string>"
}'

{
  "role": "admin",
  "sip": {
    "sipHost": "<string>",
    "sipPassword": "<string>",
    "sipUsername": "<string>"
  },
  "tokens": {
    "refreshToken": "<string>",
    "refreshTokenExpire": 123,
    "token": "<string>",
    "tokenExpire": 123
  }
}