| Bootstrap MVP | The approved, bounded implementation used to demonstrate the four ESHOPV1-EP-1 child Features; not production go-live. |
| BFF | Backend for Frontend: the thin server-side boundary that validates checkout input and communicates with PayPal Sandbox. |
| Corp v1 boundary | The wider governed platform/collaboration context containing internal infrastructure and its managed external-service relationships. |
| E-Shop workload context | The application-level context in which PayPal and AliExpress are external dependencies/sources. |
| Focus | The executable hierarchy of human-admitted tasks in active delivery states whose parent Feature is approved. |
| PayPal Sandbox | PayPal's non-production environment used with test accounts and credentials. |
| Source-evidenced catalog | A versioned static product snapshot whose claims and assets point to recorded observations. |
| Zinc / radius 0 | The neutral zinc palette and globally rectangular visual treatment used by the portal and target UI. |