curl --request POST \
  --url https://app.sandbox.rio.trade/api/users/link \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "country": "US",
  "businessName": "My Business Inc.",
  "firstName": "John",
  "middleName": "Michael",
  "lastName": "Doe",
  "secondLastName": "Smith",
  "email": "john.doe@example.com",
  "userType": "individual",
  "brokerId": "655f4084b96e4fb76f5a0e6e"
}'

{
  "userId": "66562bc04fe8bf83c577c178",
  "onboardingLink": "https://verification.example.com/session/123",
  "termsLink": "https://terms.example.com/123"
}