---
title: Customizing and developing your store
related:
  - https://docs.kentico.com/k9/custom-development.md
  - https://docs.kentico.com/k9/integrating-3rd-party-systems.md
  - https://docs.kentico.com/k9/integrating-3rd-party-systems/using-the-integration-bus.md
---

> Agent instructions:
> **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown.
>
> - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version.
> - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt).

Kentico allows you to extend the scope of available features. You can achieve this by integrating applications, utilities, website templates, etc. developed outside Kentico by third parties. You can also enhance the system by adding your custom [applications](https://docs.kentico.com/k9/custom-development/creating-custom-modules.md), [web parts](https://docs.kentico.com/k9/custom-development/developing-web-parts.md) and other items.

- [Integrating functionality with Kentico Marketplace](#integrating-functionality-with-kentico-marketplace)
- [Integrating your custom functionality](#integrating-your-custom-functionality)

## Integrating functionality with Kentico Marketplace

[Kentico Marketplace](http://devnet.kentico.com/marketplace), the official Kentico community feature sharing portal, offers a wide range of third party features recommended for use with Kentico. Among third party integrations currently offered for the E-commerce Solution, you can find:

- **Payment gateways**
  - Custom payment gateways from Kentico Marketplace extends the default payment gateways with, for example, _PayPal_ or _eWay_ payment gateway.
- **Shipping providers**
  - Kentico Marketplace also offers shipping providers, for example, for _FedEx_ with current shipping rates.
- **Tax calculation**
  - For your automated tax calculation, you can use, for example, _Avalara Connector_.
- **ERP integration**
  - You can also use ERP connectors for integration with _Microsoft Dynamics_ or _Sage 50_.

You can find these and more third party features and add-ons in the E-commerce section of the [Kentico Marketplace](http://devnet.kentico.com/Marketplace/E-commerce.aspx).

> **Info:** Before you install any add-on to your production site, check in the add-on details that the add-on works with your version of Kentico.

## Integrating your custom functionality

- You can integrate features that you developed according to your specific requirements.
  - For example, you can add your custom applications, templates, web parts, etc. You can also create your custom payment gateways, as described in detail in [Creating a custom payment gateway](https://docs.kentico.com/k9/e-commerce-features/customizing-and-developing-your-store/payment-related-customizing/creating-a-custom-payment-gateway.md), or your custom shipping provider, as described in detail in [Implementing custom shipping carrier providers](https://docs.kentico.com/k9/e-commerce-features/customizing-and-developing-your-store/implementing-custom-shipping-carrier-providers.md).
- You can integrate other third party functionality.
  - The system allows you to add third party features using, for example, the built-in [integration bus](https://docs.kentico.com/k9/integrating-3rd-party-systems/using-the-integration-bus.md) or [REST service](https://docs.kentico.com/k9/integrating-3rd-party-systems/kentico-rest-service.md).

If you need to customize the behavior of the system or wish to personalize its built-in applications, see [E-commerce customization model](https://docs.kentico.com/k9/e-commerce-features/customizing-and-developing-your-store/e-commerce-customization-model.md).