Headless storefront on SAP Commerce OCC (no Spartacus)

OCC is the REST API of SAP Commerce Cloud, served under /occ/v2. This skill covers the frontend side:

• calling OCC correctly from Angular, React / Next.js or Vue / Nuxt;
• where tokens and cart ids live;
• the SAP-specific behaviour that breaks ordinary REST assumptions.

Backend work (Java controllers, WsDTOs, ImpEx, extensions) belongs to a backend skill. Customizing Spartacus / Composable Storefront belongs to SAP's own Spartacus skill.

It targets SAP Commerce Cloud 2211-jdk21, the September 2025 framework update and later. JDK17 releases can no longer be built. Their OAuth differs, see references/auth.md → Old patterns.

The facts in these references were checked against SAP Help, the official OCC OpenAPI spec, Spartacus' source and a running 2211-jdk21 instance. Use them directly instead of researching them again. Spend research time on what they don't cover, and on this project's own backend: its /occ/v2/api-docs and its configuration.