How do you handle user authentication and access control in a SaaS application?

User authentication in a SaaS application typically involves the following steps:

• Registration: Users create an account with unique credentials.
• Authentication: Users verify their identity through passwords, OTPs, or biometric data.
• Access Control: Permissions are assigned based on user roles to restrict access to certain features or data.
• Single Sign-On: Users can access multiple services with a single set of credentials.

Access control mechanisms like role-based access control (RBAC) or attribute-based access control (ABAC) are used to define and enforce user permissions. Secure protocols like OAuth or OpenID Connect are employed for secure authentication.