Thanks ntozier and Chefkeks. I retrieved the OAuth plugin from osticket.com/download-edge as a PHAR file, so I assumed it was "legit".Anyhow, I've decided to steer clear of it since it sounds like it's maybe not ready for prime-time, and I've moved to LDAP.In case someone googling finds this, and wants to get Google Apps for Domains authentication working with osTicket, the easiest solution I found was to use a third-party IDaaS/ DaaS service, use them to manage my cloud-based identities, and have them sync to Google Apps. I did this so I could expose the IDs via LDAP without needing to run my own LDAP server. Then, I enable LDAP on that service, install the LDAP plugin on osTicket, and point it at that service. I ended up using JumpCloud, and it's working great! They offer LDAP and free use for a small number of users, and have nicely documented LDAP configs. It's working really well.