# Backchannel User Login Request

> Reference documentation for the BackchannelUserLoginRequest class which models the information needed to initiate a user login request for Client Initiated Backchannel Authentication (CIBA).

## Duende.IdentityServer.Models.BackchannelUserLoginRequest

[Section titled âDuende.IdentityServer.Models.BackchannelUserLoginRequestâ](#duendeidentityservermodelsbackchanneluserloginrequest)

Models the information to initiate a user login request for [CIBA](/identityserver/ui/ciba/).

* **`InternalId`**

  Ihe identifier of the request in the store.

* **`Subject`**

  The subject for whom the login request is intended.

* **`BindingMessage`**

  The binding message used in the request.

* **`AuthenticationContextReferenceClasses`**

  The acr\_values used in the request.

* **`Tenant`**

  The tenant value from the acr\_values used the request.

* **`IdP`**

  The idp value from the acr\_values used in the request.

* **`RequestedResourceIndicators`**

  The resource indicator values used in the request.

* **`Client`**

  The client that initiated the request.

* **`ValidatedResources`**

  The validated resources (i.e. scopes) used in the request.
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