curl --request POST \
  --url https://api.range.org/v2/account-connections/cubist/login/{loginId}/mfa/fido/complete \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "assertion": {}
}
'

{
  "login_id": "<string>",
  "mfa_types": [
    "<string>"
  ],
  "refresh_token": "<string>",
  "expiration": 123
}