SSO

■SSO
Which is SP-Initiated or Idp-Initiated when implementing SSO? 

■Impact on existing user accounts
・I would like to log in via SSO when logging into the BOX area, but is it possible to do so?
- Our company uses an "external user" (email domain other than our company), but will the "external user" log in via SSO? Or will I be unable to log in

■API support
Our company is not aware that your service is linked to an API, but is there a way to confirm that there is no API linkage?

■cost
Are there any additional costs incurred for SSO

■document
Is it possible to provide materials such as the flow of changes and procedures for switching back?