...
Note: It is possible to get a new registration where you only need to create either the User or the Organization record (e.g. the User existed in the system previously, but now works with a new organization that we don't have in the database. In that scenario, you would create a new Organization record for the registered organization, but link the Registered User to the Existing User rather than creating a new user record). As stated previously in this guide, you only want to create new records when the a corresponding record does not already exist.
Registering a New User (and Organization) for PERC
...