Sign-in, subscription and access answer different questions.

Identity: who is using the product?

Sign-in identifies an account. For a business customer, the application also needs to know which organization the user belongs to and what role they have there.

Write down how invitations, role changes and departing staff should affect that relationship.

Billing: what has the provider recorded?

If the product charges subscriptions, the billing provider has its own records and event notifications. A payment screen and the application's stored subscription state may update at different times.

Decide what customers should see while confirmation is pending, and how staff review a mismatch. The scope needs repeated and delayed event handling, not just a successful checkout demonstration.

Authorization: what may this user do now?

The application combines account membership, role and the relevant service rules to decide access. Checking sign-in alone does not establish permission to open a particular customer's record.

Test those decisions at the data and file access points as well as in the visible menu.

Staff support: how is a disagreement resolved?

A support tool should help an authorized person see the relevant state without granting unrestricted access to every customer record. Important corrections need a reason and a record of the change.

A fictional test might make one subscription update arrive twice, then confirm the application records one intended access change. This is an illustrative test idea, not a reported customer result.

Use the launch checklist to turn these rules into agreed tests.