#### [Abblix\.Oidc\.Server](https://www.abblix.com/en/docs/api/abblix-oidc-server 'index')
### [Abblix\.Oidc\.Server\.Features\.LogoutNotification](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.LogoutNotification 'Abblix\.Oidc\.Server\.Features\.LogoutNotification')

## ILogoutTokenSender Interface

Defines the interface for a service responsible for sending logout tokens to clients via the back\-channel\.

```csharp
public interface ILogoutTokenSender
```

Derived  
↳ [BackChannelLogoutTokenSender](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.LogoutNotification.BackChannelLogoutTokenSender 'Abblix\.Oidc\.Server\.Features\.LogoutNotification\.BackChannelLogoutTokenSender')
### Methods

## ILogoutTokenSender\.SendBackChannelLogoutAsync\(ClientInfo, EncodedJsonWebToken\) Method {#Abblix.Oidc.Server.Features.LogoutNotification.ILogoutTokenSender.SendBackChannelLogoutAsync(Abblix.Oidc.Server.Features.ClientInformation.ClientInfo,Abblix.Oidc.Server.Features.Tokens.EncodedJsonWebToken)}

Asynchronously sends a logout token to a client using back\-channel communication\.

```csharp
System.Threading.Tasks.Task SendBackChannelLogoutAsync(Abblix.Oidc.Server.Features.ClientInformation.ClientInfo clientInfo, Abblix.Oidc.Server.Features.Tokens.EncodedJsonWebToken logoutToken);
```
#### Parameters

###### `clientInfo` [ClientInfo](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.ClientInformation.ClientInfo 'Abblix\.Oidc\.Server\.Features\.ClientInformation\.ClientInfo') {#Abblix.Oidc.Server.Features.LogoutNotification.ILogoutTokenSender.SendBackChannelLogoutAsync(Abblix.Oidc.Server.Features.ClientInformation.ClientInfo,Abblix.Oidc.Server.Features.Tokens.EncodedJsonWebToken).clientInfo}

The information about the client to which the logout token will be sent\.
                This includes the client's identifier and any relevant endpoints for back\-channel communication\.

###### `logoutToken` [EncodedJsonWebToken](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.Tokens.EncodedJsonWebToken 'Abblix\.Oidc\.Server\.Features\.Tokens\.EncodedJsonWebToken') {#Abblix.Oidc.Server.Features.LogoutNotification.ILogoutTokenSender.SendBackChannelLogoutAsync(Abblix.Oidc.Server.Features.ClientInformation.ClientInfo,Abblix.Oidc.Server.Features.Tokens.EncodedJsonWebToken).logoutToken}

The logout token that encapsulates the logout information\.
                This token is typically a JSON Web Token \(JWT\) that contains claims relevant to the logout event,
                such as the subject identifier and the session identifier\.

#### Returns
[System\.Threading\.Tasks\.Task](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task 'System\.Threading\.Tasks\.Task')  
A [System\.Threading\.Tasks\.Task](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task 'System\.Threading\.Tasks\.Task') representing the asynchronous operation of sending the logout token\.
            The task completes when the logout token has been successfully sent to the client's back\-channel endpoint,
            or an attempt has been made to send the token\.

### Remarks
Implementations of this interface are responsible for securely transmitting the logout token
to the client's back\-channel endpoint specified in the [clientInfo](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.LogoutNotification.ILogoutTokenSender#Abblix.Oidc.Server.Features.LogoutNotification.ILogoutTokenSender.SendBackChannelLogoutAsync(Abblix.Oidc.Server.Features.ClientInformation.ClientInfo,Abblix.Oidc.Server.Features.Tokens.EncodedJsonWebToken).clientInfo 'Abblix\.Oidc\.Server\.Features\.LogoutNotification\.ILogoutTokenSender\.SendBackChannelLogoutAsync\(Abblix\.Oidc\.Server\.Features\.ClientInformation\.ClientInfo, Abblix\.Oidc\.Server\.Features\.Tokens\.EncodedJsonWebToken\)\.clientInfo')\. This process
usually involves making an HTTP POST request to the client's back\-channel logout URI with the logout token
included in the request body\.

It's important for implementations to handle any errors or exceptions that may occur during
the transmission process and ensure proper logging and error handling mechanisms are in place\.
This ensures that logout events are reliably communicated to clients, even in scenarios where
direct user\-agent\-based communication \(front\-channel logout\) is not feasible\.