# ashutoshkumar2103/billingwebapp architecture

> Architecture diagram of the GitHub repository ashutoshkumar2103/billingwebapp, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-26). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/ashutoshkumar2103/billingwebapp
- Repository: https://github.com/ashutoshkumar2103/billingwebapp

## Overview

The tree and sampled code indicate a multi-tenant billing and retail-management application, with web and POS interfaces plus platform-side merchant, subscription, and device licensing operations. A central workflow is recording sales and returns, maintaining inventory, and producing invoice documents; purchasing, reporting, catalog management, and administration are additional product areas. The README’s Phase 1 description conflicts with the current tree and sampled runtime code, so the architecture reflects those artifacts. Unsampled controller/service wiring is not inferred.

Main entry points: [`src/main/java/com/billingmanagement/document/core/DocumentEngine.java`](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/document/core/DocumentEngine.java) (Document generation), [`src/main/java/com/billingmanagement/pos/service/PosAuthService.java`](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/service/PosAuthService.java) (POS authentication), [`src/main/java/com/billingmanagement/controller/BillController.java`](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/controller/BillController.java) (Sales and returns), [`src/main/java/com/billingmanagement/platform/service/LicenseService.java`](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/platform/service/LicenseService.java) (Device licensing)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_sales["Sales and documents"]
  node_web_sales["Sales and returns"]
  node_document_engine["Document generation"]
  node_invoice_templates["Invoice templates"]
  node_document_store[("Billing records")]
  node_reporting["Reports and dashboard"]
end

subgraph group_operations["Retail operations"]
  node_inventory_web["Inventory operations"]
  node_bulk_products["Bulk product import"]
  node_product_records[("Product records<br/>[Product.java]")]
  node_purchase_orders["Purchase orders"]
end

subgraph group_pos["POS runtime"]
  node_pos_api["POS endpoints"]
  node_pos_auth["POS authentication"]
  node_jwt["JWT service<br/>[JwtService.java]"]
  node_device_sessions[("Device sessions<br/>[DeviceSession.java]")]
  node_idempotency["Request idempotency"]
  node_pos_inventory["POS inventory"]
end

subgraph group_platform["Platform administration"]
  node_platform_admin["Platform operations"]
  node_provisioning["Merchant provisioning"]
  node_license_service["Device licensing"]
  node_license_records[("License records")]
end

subgraph group_foundation["Application foundation"]
  node_spring_app["Spring application"]
end

node_merchant_user(("Merchant users"))
node_pos_users(("POS operators"))
node_mysql[("MySQL database")]

node_merchant_user -->|"submits sales"| node_web_sales
node_web_sales -->|"requests documents"| node_document_engine
node_document_engine -->|"generates PDFs"| node_invoice_templates
node_document_engine -->|"loads bills"| node_document_store
node_document_engine -->|"reads records"| node_mysql
node_inventory_web -->|"looks up products"| node_product_records
node_pos_users -->|"submits POS requests"| node_pos_api
node_pos_inventory -->|"looks up products"| node_product_records
node_pos_auth -->|"stores sessions"| node_device_sessions
node_pos_auth -->|"issues tokens"| node_jwt
node_idempotency -->|"stores reservations"| node_mysql
node_platform_admin -->|"manages licenses"| node_license_service
node_license_service -->|"reads and writes"| node_license_records
node_provisioning -->|"persists merchant setup"| node_mysql
node_spring_app -->|"uses persistence"| node_mysql

click node_web_sales "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/controller/BillController.java"
click node_document_engine "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/document/core/DocumentEngine.java"
click node_invoice_templates "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/document/template/TaxInvoiceTemplate.java"
click node_document_store "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/repository/BillRepository.java"
click node_reporting "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/controller/ReportController.java"
click node_inventory_web "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/controller/InventoryController.java"
click node_bulk_products "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/service/ProductBulkExcelService.java"
click node_product_records "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/entity/Product.java"
click node_purchase_orders "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/controller/PurchaseOrderController.java"
click node_pos_api "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/controller/PosBillController.java"
click node_pos_auth "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/service/PosAuthService.java"
click node_jwt "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/auth/JwtService.java"
click node_device_sessions "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/entity/DeviceSession.java"
click node_idempotency "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/service/PosIdempotencyService.java"
click node_pos_inventory "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/controller/PosInventoryController.java"
click node_platform_admin "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/platform/controller/SubscriptionManagementController.java"
click node_provisioning "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/platform/service/MerchantProvisioningService.java"
click node_license_service "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/platform/service/LicenseService.java"
click node_license_records "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/platform/repository/LicenseRepository.java"
click node_spring_app "https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/BillingManagementApplication.java"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_web_sales,node_document_engine,node_invoice_templates,node_document_store,node_reporting,node_merchant_user toneBlue
class node_inventory_web,node_bulk_products,node_product_records,node_purchase_orders,node_mysql toneAmber
class node_pos_api,node_pos_auth,node_jwt,node_device_sessions,node_idempotency,node_pos_inventory toneMint
class node_platform_admin,node_provisioning,node_license_service,node_license_records toneRose
class node_spring_app,node_pos_users toneIndigo
```

## Components

### Sales and documents

- [Sales and returns](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/controller/BillController.java): `src/main/java/com/billingmanagement/controller/BillController.java`
- [Document generation](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/document/core/DocumentEngine.java): `src/main/java/com/billingmanagement/document/core/DocumentEngine.java`
- [Invoice templates](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/document/template/TaxInvoiceTemplate.java): `src/main/java/com/billingmanagement/document/template/TaxInvoiceTemplate.java`
- [Billing records](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/repository/BillRepository.java): `src/main/java/com/billingmanagement/repository/BillRepository.java`
- [Reports and dashboard](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/controller/ReportController.java): `src/main/java/com/billingmanagement/controller/ReportController.java`

### Retail operations

- [Inventory operations](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/controller/InventoryController.java): `src/main/java/com/billingmanagement/controller/InventoryController.java`
- [Bulk product import](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/service/ProductBulkExcelService.java): `src/main/java/com/billingmanagement/service/ProductBulkExcelService.java`
- [Product records](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/entity/Product.java): `src/main/java/com/billingmanagement/entity/Product.java`
- [Purchase orders](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/controller/PurchaseOrderController.java): `src/main/java/com/billingmanagement/controller/PurchaseOrderController.java`

### POS runtime

- [POS endpoints](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/controller/PosBillController.java): `src/main/java/com/billingmanagement/pos/controller/PosBillController.java`
- [POS authentication](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/service/PosAuthService.java): `src/main/java/com/billingmanagement/pos/service/PosAuthService.java`
- [JWT service](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/auth/JwtService.java): `src/main/java/com/billingmanagement/pos/auth/JwtService.java`
- [Device sessions](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/entity/DeviceSession.java): `src/main/java/com/billingmanagement/pos/entity/DeviceSession.java`
- [Request idempotency](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/service/PosIdempotencyService.java): `src/main/java/com/billingmanagement/pos/service/PosIdempotencyService.java`
- [POS inventory](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/pos/controller/PosInventoryController.java): `src/main/java/com/billingmanagement/pos/controller/PosInventoryController.java`

### Platform administration

- [Platform operations](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/platform/controller/SubscriptionManagementController.java): `src/main/java/com/billingmanagement/platform/controller/SubscriptionManagementController.java`
- [Merchant provisioning](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/platform/service/MerchantProvisioningService.java): `src/main/java/com/billingmanagement/platform/service/MerchantProvisioningService.java`
- [Device licensing](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/platform/service/LicenseService.java): `src/main/java/com/billingmanagement/platform/service/LicenseService.java`
- [License records](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/platform/repository/LicenseRepository.java): `src/main/java/com/billingmanagement/platform/repository/LicenseRepository.java`

### Application foundation

- [Spring application](https://github.com/ashutoshkumar2103/billingwebapp/blob/main/src/main/java/com/billingmanagement/BillingManagementApplication.java): `src/main/java/com/billingmanagement/BillingManagementApplication.java`

### Other components

- **Merchant users**
- **POS operators**
- **MySQL database**

## Connections

- Merchant users → Sales and returns: submits sales
- Sales and returns → Document generation: requests documents
- Document generation → Invoice templates: generates PDFs
- Document generation → Billing records: loads bills
- Document generation → MySQL database: reads records
- Inventory operations → Product records: looks up products
- POS operators → POS endpoints: submits POS requests
- POS inventory → Product records: looks up products
- POS authentication → Device sessions: stores sessions
- POS authentication → JWT service: issues tokens
- Request idempotency → MySQL database: stores reservations
- Platform operations → Device licensing: manages licenses
- Device licensing → License records: reads and writes
- Merchant provisioning → MySQL database: persists merchant setup
- Spring application → MySQL database: uses persistence