> For the complete documentation index, see [llms.txt](https://docs.keyless.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.keyless.io/consumer/server-api.md).

# Server API

- [Getting Started](https://docs.keyless.io/consumer/server-api/getting-started.md): This API allows for backend-to-backend communication between your backend and the Keyless servers.
- [Users](https://docs.keyless.io/consumer/server-api/users.md): This set of API calls allows you to make operations on various Keyless users.
- [External User ID](https://docs.keyless.io/consumer/server-api/external-users.md): This set of API calls allows you to perform operations to Create, Modify, Delete and Retrieve External User IDs
- [Devices](https://docs.keyless.io/consumer/server-api/devices.md): This set of API calls allows you to fetch and manipulate Keyless enabled devices.
- [Operations](https://docs.keyless.io/consumer/server-api/operations.md): This set of API calls allows you to fetch operations on various Keyless entities.
- [Telemetry](https://docs.keyless.io/consumer/server-api/telemetry.md): This API calls allows you to retrieve meta data related to a user or specific transaction.