shopify

Core Components:

• Shopify CLI - Development workflow tool
• GraphQL Admin API - Primary API for data operations (recommended)
• REST Admin API - Legacy API (maintenance mode)
• Polaris UI - Design system for consistent interfaces
• Liquid - Template language for themes

Extension Points:

• Checkout UI - Customize checkout experience
• Admin UI - Extend admin dashboard
• POS UI - Point of Sale customization
• Customer Account - Post-purchase pages
• Theme App Extensions - Embedded theme functionality

Prerequisites

```bash

# Install Shopify CLI

npm install -g @shopify/cli@latest

# Verify installation

shopify version

```

Create New App

```bash

# Initialize app

shopify app init

# Start development server

shopify app dev

# Generate extension

shopify app generate extension --type checkout_ui_extension

# Deploy

shopify app deploy

```

Theme Development

```bash

# Initialize theme

shopify theme init

# Start local preview

shopify theme dev

# Pull from store

shopify theme pull --live

# Push to store

shopify theme push --development

```

1. App Development

Setup:

```bash

shopify app init

cd my-app

```

Configure Access Scopes (shopify.app.toml):

```toml

[access_scopes]

scopes = "read_products,write_products,read_orders"

```

Start Development:

```bash

shopify app dev # Starts local server with tunnel

```

Add Extensions:

```bash

shopify app generate extension --type checkout_ui_extension

```

Deploy:

```bash

shopify app deploy # Builds and uploads to Shopify

```

2. Extension Development

Available Types:

• Checkout UI - checkout_ui_extension
• Admin Action - admin_action
• Admin Block - admin_block
• POS UI - pos_ui_extension
• Function - function (discounts, payment, delivery, validation)

Workflow:

```bash

shopify app generate extension

# Select type, configure

shopify app dev # Test locally

shopify app deploy # Publish

```

3. Theme Development

Setup:

```bash

shopify theme init

# Choose Dawn (reference theme) or start fresh

```

Local Development:

```bash

shopify theme dev

# Preview at localhost:9292

# Auto-syncs to development theme

```

Deployment:

```bash

shopify theme push --development # Push to dev theme

shopify theme publish --theme=123 # Set as live

```

Build an App When:

• Integrating external services
• Adding functionality across multiple stores
• Building merchant-facing admin tools
• Managing store data programmatically
• Implementing complex business logic
• Charging for functionality

Build an Extension When:

• Customizing checkout flow
• Adding fields/features to admin pages
• Creating POS actions for retail
• Implementing discount/payment/shipping rules
• Extending customer account pages

Build a Theme When:

• Creating custom storefront design
• Building unique shopping experiences
• Customizing product/collection pages
• Implementing brand-specific layouts
• Modifying homepage/content pages

Combination Approach:

App + Theme Extension:

• App handles backend logic and data
• Theme extension provides storefront UI
• Example: Product reviews, wishlists, size guides

GraphQL Product Query

```graphql

query GetProducts($first: Int!) {

products(first: $first) {

edges {

node {

id

title

handle

variants(first: 5) {

edges {

node {

id

price

inventoryQuantity

}

}

}

}

}

pageInfo {

hasNextPage

endCursor

}

}

}

```

Checkout Extension (React)

```javascript

import { reactExtension, BlockStack, TextField, Checkbox } from '@shopify/ui-extensions-react/checkout';

export default reactExtension('purchase.checkout.block.render', () => );

function Extension() {

const [message, setMessage] = useState('');

return (

);

}

```

Liquid Product Display

```liquid

{% for product in collection.products %}

{% endfor %}

```

API Usage:

• Prefer GraphQL over REST for new development
• Request only needed fields to reduce costs
• Implement pagination for large datasets
• Use bulk operations for batch processing
• Respect rate limits (cost-based for GraphQL)

Security:

• Store API credentials in environment variables
• Verify webhook signatures
• Use OAuth for public apps
• Request minimal access scopes
• Implement session tokens for embedded apps

Performance:

• Cache API responses when appropriate
• Optimize images in themes
• Minimize Liquid logic complexity
• Use async loading for extensions
• Monitor query costs in GraphQL

Testing:

• Use development stores for testing
• Test across different store plans
• Verify mobile responsiveness
• Check accessibility (keyboard, screen readers)
• Validate GDPR compliance

Detailed guides for advanced topics:

• [App Development](references/app-development.md) - OAuth, APIs, webhooks, billing
• [Extensions](references/extensions.md) - Checkout, Admin, POS, Functions
• [Themes](references/themes.md) - Liquid, sections, deployment

[shopify_init.py](scripts/shopify_init.py) - Initialize Shopify projects interactively

```bash

python scripts/shopify_init.py

```

Rate Limit Errors:

• Monitor X-Shopify-Shop-Api-Call-Limit header
• Implement exponential backoff
• Use bulk operations for large datasets

Authentication Failures:

• Verify access token validity
• Check required scopes granted
• Ensure OAuth flow completed

Extension Not Appearing:

• Verify extension target correct
• Check extension published
• Ensure app installed on store

Webhook Not Receiving:

• Verify webhook URL accessible
• Check signature validation
• Review logs in Partner Dashboard

Official Documentation:

• Shopify Docs: https://shopify.dev/docs
• GraphQL API: https://shopify.dev/docs/api/admin-graphql
• Shopify CLI: https://shopify.dev/docs/api/shopify-cli
• Polaris: https://polaris.shopify.com

Tools:

• GraphiQL Explorer (Admin → Settings → Apps → Develop apps)
• Partner Dashboard (app management)
• Development stores (free testing)

API Versioning:

• Quarterly releases (YYYY-MM format)
• Current: 2025-01
• 12-month support per version
• Test before version updates

---

Note: This skill covers Shopify platform as of January 2025. Refer to official documentation for latest updates.