These guides explain what the portal does, how data moves between WHMCS and Salesforce, and where caching affects what people see. They avoid deep implementation detail and focus on flows, data ownership, and error handling.
Start with `system-overview.md`, then jump into the feature you care about:
-`COMPLETE-GUIDE.md` — single, end-to-end explanation of how the portal works
-`system-overview.md` — high-level architecture, data ownership, and caching quick reference.
-`accounts-and-identity.md` — how sign-up, WHMCS linking, and address/profile updates behave.
-`catalog-and-checkout.md` — where products/pricing come from and what we check before checkout.