> For the complete documentation index, see [llms.txt](https://docs.digitalriver.com/commercetools-1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.digitalriver.com/commercetools-1/use-the-commercetools-merchant-center-custom-application.md).

# Use the commercetools Merchant Center custom application

## commercetools Merchant Center custom application <a href="#deployment" id="deployment"></a>

The integration comes with the commercetools [Merchant Center custom application](https://docs.commercetools.com/custom-applications/) which lets you do the following:

* Set and rotate Digital River API keys and webhook secrets.
* Configure one or more `shipFrom` addresses to be used with Digital River orders.
* View the status of the synchronization of product data from commercetools to Digital River.
* Perform a full catalog sync between commercetools and Digital.

The custom application is written in [React](https://reactjs.org/) using the [components supplied by commercetools](https://docs.commercetools.com/custom-applications/) and is supplied as source code.

This section provides information on the following areas related to using the Merchant Center custom application with the integration:

* Installing and deploying the Merchant Center custom application&#x20;
* Configuring the Merchant Center custom application
* Integrating with a store for payments
* Configuring shipping methods
* Enabling customer management options
* Understanding commercetools logs
* Merchant Center User Guide - describes how to use the Merchant Center custom application as a tool in the integration
* Understanding integration logs