> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/knowledge-hub/products/cc-software/configure/interface-options/api.md).

# APIs and middleware

Choose Command Centre APIs, controller integrations, and middleware plugins.

Use APIs and middleware to exchange data between Command Centre and external applications. Select the interface that matches your integration architecture and supported technology.

| Interface                                                                                                                                                               | Use it for                                                                    |
| ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------- |
| [ASCII interface](/knowledge-hub/products/cc-software/configure/interface-options/api/ascii-interface-crps.md)                                                          | Compare ASCII interface options for Command Centre and third-party systems    |
| [Controller Resident Plugin (CRPS)](/knowledge-hub/products/cc-software/configure/interface-options/api/crps-basic-configuration.md)                                    | Configure Controller-Resident ASCII Text Plugin messages for external systems |
| [Cardholder change tracking API](/knowledge-hub/products/cc-software/configure/interface-options/api/cardholder-change-tracking-api.md)                                 | Support existing change tracking integrations and migrate them to REST        |
| [Controller API (FTCAPI) and Middleware Framework (FMF)](/knowledge-hub/products/cc-software/configure/interface-options/api/controller-api-ftcapi-and-middleware-f.md) | Compare controller API and middleware integrations                            |
| [Representational state transfer (REST) API](/knowledge-hub/products/cc-software/configure/interface-options/api/representational-state-transfer-rest-api.md)           | Integrate applications over HTTP using licensed REST API editions             |

***


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