Enhance documentation, implement Twilio OTP delivery, and update payment gateway methods. Updated AGENTS.md and README.md for clarity on ExecPlans and architecture. Added Twilio as a dependency and implemented capture/refund methods in MoyasarGateway. Improved frontend routing with react-router-dom and added authentication context. Updated styles and localization files for better user experience.

2026-02-28 15:33:50 +03:00
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+# Architecture
+
+## Overview
+
+The Salon platform is a Django REST API backend with a React/Vite frontend, optimized for KSA (phone auth, Riyadh timezone, Arabic locale).
+
+## Backend Apps and Responsibilities
+
+| App | Responsibility |
+|-----|----------------|
+| **accounts** | User model, phone/OTP auth, JWT tokens, locale preferences. OTP providers (console, Twilio, Unifonic) send SMS/WhatsApp. |
+| **salons** | Salon catalog, services, staff, availability windows, reviews. Read-only public APIs. |
+| **bookings** | Booking model, validation (availability, overlap prevention), status transitions. Triggers notifications on create and status change. |
+| **payments** | Payment model, Moyasar integration (create, capture, refund), webhook reconciliation, idempotency. |
+| **notifications** | Booking lifecycle notifications (SMS/WhatsApp). Reuses OTP providers; sends on booking created/confirmed/cancelled. |
+
+## Data Flow
+
+```
+User → React Frontend → Django API
+         ↓
+    accounts (auth) ──→ OTP providers (Twilio/Unifonic/console)
+    salons (catalog)
+    bookings ──→ notifications ──→ OTP providers
+    payments ──→ Moyasar gateway
+```
+
+## Async and Observability (MVP Decision)
+
+**Decision (MVP):** All OTP sends, booking notifications, and payment gateway calls run **synchronously** in the request/response path. No Celery, RQ, or other task queue for the initial launch.
+
+**Rationale:**
+- Reduces deployment complexity (no Redis, no worker processes).
+- MVP traffic is expected to be low; synchronous latency is acceptable.
+- External calls already use timeouts (e.g. Moyasar: 10s, Twilio: SDK default).
+
+**Future:** When scaling, introduce a task queue (e.g. Celery + Redis) for OTP and notification sends. Payment creation and webhooks should remain synchronous for immediate feedback and idempotency.
+
+**Observability:** Errors are logged via Python `logging` and stored in model metadata (e.g. `Payment.metadata["gateway_error"]`, `Notification.error_message`). Structured logging and metrics are Phase 3 work.