curl --request POST \
  --url https://our-secret-api-url.com/auth/register \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <x-api-key>' \
  --data '
{
  "name": "<string>",
  "username": "<string>",
  "email": "<string>",
  "phone": "<string>"
}
'

{
  "message": "<string>",
  "userId": 123
}