01 / The workflowStart with one useful customer journey
Define the status, action, or exchange the portal will support. Make the distinction between view-only information and actions that change business records. Decide how customers receive access and what happens when an invitation expires, an email changes, or an account is no longer authorized.
02 / The workflowDesign permissions at the data boundary
Do not rely on hiding a button to protect a record. Specify server-side authorization, organization boundaries where needed, role-specific access, and tests for attempts to reach another customer’s data. Recovery flows and administrator access should be reviewed alongside normal sign-in. No design can be honestly described as hack-proof.
03 / The workflowPlan operations and ownership
Discuss backups, monitoring, incident response, data export, retention, and who maintains the system. Payment processing and sensitive document exchange introduce additional requirements that must be assessed for the specific use case. A portal mockup or successful login is not evidence that these operational controls are complete.