# httpmuhammadsalman/fastauth-shopping architecture

> Architecture diagram of the GitHub repository httpmuhammadsalman/fastauth-shopping, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-28). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/httpmuhammadsalman/fastauth-shopping
- Repository: https://github.com/httpmuhammadsalman/fastauth-shopping

## Overview

FastAuth Shop is a demo storefront for creating and updating FastAuth carts, then completing payment in an embedded checkout. Shoppers browse the catalog, manage a locally persisted cart, submit it through the cart API routes, and receive payment confirmation from the checkout iframe. The map also includes the published integration guide. The cart API client and product-card implementations were not sampled; their nodes and connections reflect the documented/runtime roles visible from the tree and callers.

Main entry points: [`src/lib/fastauth.ts`](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/lib/fastauth.ts) (FastAuth API adapter), [`src/lib/cart-context.tsx`](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/lib/cart-context.tsx) (Cart state), [`src/app/cart/page.tsx`](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/cart/page.tsx) (Cart and checkout), [`src/components/CheckoutModal.tsx`](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/components/CheckoutModal.tsx) (Checkout modal)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_storefront["Storefront"]
  node_home["Product listing<br/>[page.tsx]"]
  node_productcards["Product cards<br/>[ProductCard.tsx]"]
  node_catalog["Product catalog<br/>[products.ts]"]
  node_layout["App layout<br/>[layout.tsx]"]
end

subgraph group_cart["Cart management"]
  node_cartpage["Cart and checkout<br/>[page.tsx]"]
  node_cartstate["Cart state<br/>[cart-context.tsx]"]
  node_browserstore[("Browser storage")]
  node_cartclient["Cart API client<br/>[cart-api.ts]"]
end

subgraph group_payments["FastAuth checkout"]
  node_createcart["Create cart route<br/>[route.ts]"]
  node_updatecart["Update cart route<br/>[route.ts]"]
  node_fastauthlib["FastAuth API adapter<br/>[fastauth.ts]"]
  node_env["API configuration<br/>[env.ts]"]
  node_checkoutmodal["Checkout modal<br/>[CheckoutModal.tsx]"]
end

subgraph group_guides["Integration guide"]
  node_guide["Integration guide<br/>[page.tsx]"]
end

node_shopper(("Shopper"))
node_fastauthapi{{"FastAuth cart API"}}
node_checkoutservice{{"FastAuth checkout"}}

node_shopper -->|"browses"| node_home
node_home -->|"renders products"| node_catalog
node_home -->|"renders cards"| node_productcards
node_shopper -->|"adds products"| node_productcards
node_productcards -->|"updates cart"| node_cartstate
node_layout -->|"provides state"| node_cartstate
node_cartstate -->|"resolves products"| node_catalog
node_cartstate -->|"persists cart"| node_browserstore
node_browserstore -->|"restores cart"| node_cartstate
node_shopper -->|"manages cart"| node_cartpage
node_cartpage -->|"reads and updates"| node_cartstate
node_cartpage -->|"submits cart"| node_cartclient
node_cartclient -->|"posts cart"| node_createcart
node_cartclient -->|"posts updates"| node_updatecart
node_createcart -->|"builds and sends"| node_fastauthlib
node_updatecart -->|"builds and sends"| node_fastauthlib
node_fastauthlib -->|"reads prices"| node_catalog
node_fastauthlib -->|"reads settings"| node_env
node_fastauthlib -->|"posts cart"| node_fastauthapi
node_fastauthapi -->|"returns cart"| node_fastauthlib
node_cartpage -->|"opens checkout"| node_checkoutmodal
node_checkoutmodal -->|"embeds checkout"| node_checkoutservice
node_checkoutservice -->|"posts payment event"| node_checkoutmodal
node_checkoutmodal -->|"reports payment"| node_cartpage
node_shopper -->|"reads guide"| node_guide

click node_home "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/page.tsx"
click node_productcards "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/components/ProductCard.tsx"
click node_catalog "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/lib/products.ts"
click node_layout "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/layout.tsx"
click node_cartpage "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/cart/page.tsx"
click node_cartstate "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/lib/cart-context.tsx"
click node_cartclient "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/lib/cart-api.ts"
click node_createcart "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/api/cart/route.ts"
click node_updatecart "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/api/cart/%5BcartId%5D/route.ts"
click node_fastauthlib "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/lib/fastauth.ts"
click node_env "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/config/env.ts"
click node_checkoutmodal "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/components/CheckoutModal.tsx"
click node_guide "https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/docs/page.tsx"

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_home,node_productcards,node_catalog,node_layout toneBlue
class node_cartpage,node_cartstate,node_browserstore,node_cartclient toneAmber
class node_createcart,node_updatecart,node_fastauthlib,node_env,node_checkoutmodal,node_fastauthapi toneMint
class node_guide toneRose
class node_shopper,node_checkoutservice toneIndigo
```

## Components

### Storefront

- [Product listing](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/page.tsx): `src/app/page.tsx`
- [Product cards](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/components/ProductCard.tsx): `src/components/ProductCard.tsx`
- [Product catalog](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/lib/products.ts): `src/lib/products.ts`
- [App layout](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/layout.tsx): `src/app/layout.tsx`

### Cart management

- [Cart and checkout](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/cart/page.tsx): `src/app/cart/page.tsx`
- [Cart state](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/lib/cart-context.tsx): `src/lib/cart-context.tsx`
- **Browser storage**
- [Cart API client](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/lib/cart-api.ts): `src/lib/cart-api.ts`

### FastAuth checkout

- [Create cart route](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/api/cart/route.ts): `src/app/api/cart/route.ts`
- [Update cart route](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/api/cart/%5BcartId%5D/route.ts): `src/app/api/cart/[cartId]/route.ts`
- [FastAuth API adapter](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/lib/fastauth.ts): `src/lib/fastauth.ts`
- [API configuration](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/config/env.ts): `src/config/env.ts`
- [Checkout modal](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/components/CheckoutModal.tsx): `src/components/CheckoutModal.tsx`

### Integration guide

- [Integration guide](https://github.com/httpmuhammadsalman/fastauth-shopping/blob/main/src/app/docs/page.tsx): `src/app/docs/page.tsx`

### Other components

- **Shopper**
- **FastAuth cart API**
- **FastAuth checkout**

## Connections

- Shopper → Product listing: browses
- Product listing → Product catalog: renders products
- Product listing → Product cards: renders cards
- Shopper → Product cards: adds products
- Product cards → Cart state: updates cart
- App layout → Cart state: provides state
- Cart state → Product catalog: resolves products
- Cart state → Browser storage: persists cart
- Browser storage → Cart state: restores cart
- Shopper → Cart and checkout: manages cart
- Cart and checkout → Cart state: reads and updates
- Cart and checkout → Cart API client: submits cart
- Cart API client → Create cart route: posts cart
- Cart API client → Update cart route: posts updates
- Create cart route → FastAuth API adapter: builds and sends
- Update cart route → FastAuth API adapter: builds and sends
- FastAuth API adapter → Product catalog: reads prices
- FastAuth API adapter → API configuration: reads settings
- FastAuth API adapter → FastAuth cart API: posts cart
- FastAuth cart API → FastAuth API adapter: returns cart
- Cart and checkout → Checkout modal: opens checkout
- Checkout modal → FastAuth checkout: embeds checkout
- FastAuth checkout → Checkout modal: posts payment event
- Checkout modal → Cart and checkout: reports payment
- Shopper → Integration guide: reads guide