Logical data-processing map

 Customer browser
       │
       ├► Marketing site (CMS/static) ─ privacy analytics hooks per cookie banner
       │
       └► Authenticated billing portal ─ client.hoststack.pro
               ├── Invoices · GST rendering · transactional email
               ├── Payment processors (PCI scope on gateways)
               ├── Tickets · optional chat transcripts
               ├── VPS / reseller automation APIs
               └── Backups snapshots (SKU-dependent)

Detailed processor categories reside in subprocessors register. Plain-language geography vs billing flows: India residency briefing. SKU POP advertised at checkout remains authoritative.