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+# Architecture Overview
+
+## Backend & Contract Interactions
+
+```mermaid
+graph TD
+  FE[Frontend] -- REST/gRPC --> BE[Backend]
+  BE -- Soroban SDK --> SC[Smart Contract]
+  SC -- Events --> BE
+  BE -- Webhooks --> FE
+```
+
+- **Frontend** communicates with the **Backend** via REST/gRPC APIs.
+- **Backend** interacts with **Soroban Smart Contracts** for payment logic.
+- **Smart Contracts** emit events consumed by the Backend.
+- **Backend** notifies the Frontend via webhooks or polling.
+
+## Key Components
+- **Frontend:** Next.js app for user interaction
+- **Backend:** NestJS API server
+- **Contracts:** Soroban smart contracts (Rust)
+
+---
+
+For more details, see [docs/](./).