Authoritative Architecture Specification

Unified Central API & Developer Reference

High-throughput sovereign routing layer providing central authentication, Meta WhatsApp messaging, Hostinger transactional email, idempotent document hosting, customer identity reconciliation, and double-entry prepaid card ledgers across all AVS applications.

Security & Authentication

Cryptographic 24-Byte App Keys

SHA-256 hashed storage, scoped RBAC

Architecture Separation

AVS Central + Merchant BYO

Strict tenant balance & provider isolation

Multi-Channel Outbox

Meta Cloud API + Titan SMTP

Full queue durability & n8n orchestration

Offline Resilience

100% Local POS Billing

Asynchronous outbox sync on internet resume

Core Infrastructure

GET /v1/health

POST /v1/auth/token

POST /v1/applications

Communications Gateway

POST /v1/whatsapp/send-template

POST /v1/whatsapp/send-invoice

POST /v1/whatsapp/send-message

POST /v1/email/send

Documents & Invoices

POST /v1/documents/upload

GET /v1/documents/:token

Customers & Cards

POST /v1/customers/register

POST /v1/cards/identify

POST /v1/cards/debit

Merchant Integrations

POST /v1/integrations/merchant

POST /v1/webhooks/zomato/order

GET /v1/health

Real-time status check of central database, storage volumes, and communication outboxes.

X-AVS-App-Id Header

X-AVS-Api-Key Header

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