# Previous steps

Please note that the SCIM REST Web Service Add-on installed must be installed, please check this part in [How to use SCIM in Soffid # Installation](https://bookstack.soffid.com/link/120#bkmrk-installation)

Please note that a user with the authentication is required, please check this part in [How to use SCIM in Soffid # Confirm authorization](https://bookstack.soffid.com/link/120#bkmrk-confirm-authorizatio)

Please note that is recommended to use a REST client, please see our example in [Testing tool # RESTer](https://bookstack.soffid.com/link/118#bkmrk-rester)

Please note that the correct header parameters must be used, please browse them in [SCIM in Soffid # HTTP request](https://bookstack.soffid.com/link/114#bkmrk-http-request)