# Extend the functionality of the Merchant Center

Merchant Center customizations are sets of UI tools and components for extending the existing functionality of the Merchant Center. These customizations come in the form of Custom Applications and Custom Views.

To learn more about each customization type, including how they can help you, see [Getting started](https://docs.commercetools.com/merchant-center-customizations/overview.md).

- Built on modern technologies

  Develop JavaScript applications with React, GraphQL, Webpack, and other modern technologies.

- Based on a solid design system

  Design and build using components from our design system, [UI Kit](https://uikit.commercetools.com/), which provides rules, patterns, and best practices.

- Zero config development tools

  Focus more on implementing the right features instead of configuration. Our open source packages [Application Kit](https://github.com/commercetools/merchant-center-application-kit) and [UI Kit](https://github.com/commercetools/ui-kit) provide all the necessary tools and components to get started.

## Navigation

- Getting started
  - [Merchant Center Customizations overview](https://docs.commercetools.com/merchant-center-customizations/overview.md)
  - [Custom Applications](https://docs.commercetools.com/merchant-center-customizations/custom-applications.md)
  - [Custom Views](https://docs.commercetools.com/merchant-center-customizations/custom-views.md)
  - [Accessibility](https://docs.commercetools.com/merchant-center-customizations/accessibility.md)
  - [Maintenance guidelines](https://docs.commercetools.com/merchant-center-customizations/maintenance-guidelines.md)
  - [Troubleshooting](https://docs.commercetools.com/merchant-center-customizations/troubleshooting.md)
- Concepts
  - [OAuth scopes and user permissions](https://docs.commercetools.com/merchant-center-customizations/concepts/oauth-scopes-and-user-permissions.md)
  - [Merchant Center Proxy Router](https://docs.commercetools.com/merchant-center-customizations/concepts/merchant-center-proxy-router.md)
  - [Merchant Center API](https://docs.commercetools.com/merchant-center-customizations/concepts/merchant-center-api.md)
  - [Integrate with your own API](https://docs.commercetools.com/merchant-center-customizations/concepts/integrate-with-your-own-api.md)
  - [Deployment previews](https://docs.commercetools.com/merchant-center-customizations/concepts/deployment-previews.md)
  - Design guidelines
    - [Design guidelines for Custom Views](https://docs.commercetools.com/merchant-center-customizations/concepts/design-guidelines/custom-views.md)
- Development
  - [Development](https://docs.commercetools.com/merchant-center-customizations/development.md)
  - [Data fetching](https://docs.commercetools.com/merchant-center-customizations/development/data-fetching.md)
  - [UI components](https://docs.commercetools.com/merchant-center-customizations/development/ui-components.md)
  - [Routing](https://docs.commercetools.com/merchant-center-customizations/development/routing.md)
  - [Forms](https://docs.commercetools.com/merchant-center-customizations/development/forms.md)
  - [Page content layouts](https://docs.commercetools.com/merchant-center-customizations/development/page-content-layouts.md)
  - [Notifications](https://docs.commercetools.com/merchant-center-customizations/development/notifications.md)
  - [Testing](https://docs.commercetools.com/merchant-center-customizations/development/testing.md)
  - [Translations](https://docs.commercetools.com/merchant-center-customizations/development/translations.md)
  - [Permissions](https://docs.commercetools.com/merchant-center-customizations/development/permissions.md)
  - [Page titles](https://docs.commercetools.com/merchant-center-customizations/development/page-titles.md)
  - [Adding TypeScript](https://docs.commercetools.com/merchant-center-customizations/development/adding-typescript.md)
  - [Going to production](https://docs.commercetools.com/merchant-center-customizations/development/going-to-production.md)
- Deployment
  - [Deployment overview](https://docs.commercetools.com/merchant-center-customizations/deployment/overview.md)
  - [Deploy to Connect](https://docs.commercetools.com/merchant-center-customizations/deployment/commercetools-connect.md)
  - [Deploy to Vercel](https://docs.commercetools.com/merchant-center-customizations/deployment/vercel.md)
  - [Deploy to Netlify](https://docs.commercetools.com/merchant-center-customizations/deployment/netlify.md)
  - [Deploy to Render](https://docs.commercetools.com/merchant-center-customizations/deployment/render.md)
  - [Deploy to AWS with S3 and CloudFront](https://docs.commercetools.com/merchant-center-customizations/deployment/aws-s3-cloudfront.md)
  - [Deploy to Azure with Static Web Apps](https://docs.commercetools.com/merchant-center-customizations/deployment/azure-static-web-apps.md)
  - [Deploy to Azure with Blob Storage](https://docs.commercetools.com/merchant-center-customizations/deployment/azure-blob-storage.md)
  - [Deploy to Surge](https://docs.commercetools.com/merchant-center-customizations/deployment/surge.md)
  - [Deploy to Cloudflare Pages](https://docs.commercetools.com/merchant-center-customizations/deployment/cloudflare.md)
  - [Deploy to Google Cloud with Static Web Apps](https://docs.commercetools.com/merchant-center-customizations/deployment/google-cloud-static-web-apps.md)
- Tooling and configuration
  - [Tooling and configuration overview](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/overview.md)
  - [CLI](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/cli.md)
  - [Custom Application Config](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/custom-application-config.md)
  - [Custom View Config](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/custom-view-config.md)
  - [Module bundler](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/module-bundler.md)
  - Packages
    - [Global actions](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/commercetools-frontend-actions-global.md)
    - [Application Shell](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/commercetools-frontend-application-shell.md)
    - [Application Shell connectors](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/commercetools-frontend-application-shell-connectors.md)
    - [Application components](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/commercetools-frontend-application-components.md)
    - [Constants](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/commercetools-frontend-constants.md)
    - [Cypress](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/commercetools-frontend-cypress.md)
    - [Jest preset](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/commercetools-frontend-jest-preset-mc-app.md)
    - [Permissions](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/commercetools-frontend-permissions.md)
    - [Internationalization](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/commercetools-frontend-i18n.md)
    - [Localization](https://docs.commercetools.com/merchant-center-customizations/tooling-and-configuration/commercetools-frontend-l10n.md)