Develop an invite system that generates a unique hash for each invitee, combining a secret key, the SaySo ID, and the invitee's email address. This hash will be used to verify users and grant access to specific SaySos. When a user tries to access a SaySo, the system will check if the hash in their URL matches the one generated by their email and the SaySo ID. If the hash matches, the user gains access; if not, access is denied. This method ensures that only invited users with the correct hash can participate, enhancing both security and the ability to control access to specific engagements.