Creates a new referring customer or returns an existing one for the provided contact ID.
You can use "me" instead of a specific contact ID to generate a referring customer for the current identity's contact.
See About Identities to learn more about identities.
You can only call this method when authenticated as a Wix app or Wix user identity.
This method doesn't return any custom errors, but may return standard errors. Learn more about standard Wix errors.