I am asked to built a web application in php where the back end database is going to be Salesforce Objects. The scenario is that "users" (can be 10,000+) would register/log in to the application and schedule a slot for an exam. Then take that exam, view their credits and performance.
I would like to know a better approach to start this. Like how would I be able to access the objects using php and how well can I maintain authenticity in this scenario.