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

## IBackChannelAuthenticationResponseFormatter Interface

Defines an interface for formatting a back\-channel authentication response to be sent to a client or external system\.

```csharp
public interface IBackChannelAuthenticationResponseFormatter
```

Derived  
↳ [BackChannelAuthenticationResponseFormatter](https://www.abblix.com/en/docs/api/abblix-oidc-server-mvc/Abblix.Oidc.Server.Mvc.Formatters.BackChannelAuthenticationResponseFormatter 'Abblix\.Oidc\.Server\.Mvc\.Formatters\.BackChannelAuthenticationResponseFormatter')
### Methods

## IBackChannelAuthenticationResponseFormatter\.FormatResponseAsync\(BackChannelAuthenticationRequest, ClientRequest, Result\<BackChannelAuthenticationSuccess,OidcError\>\) Method {#Abblix.Oidc.Server.Mvc.Formatters.Interfaces.IBackChannelAuthenticationResponseFormatter.FormatResponseAsync(Abblix.Oidc.Server.Model.BackChannelAuthenticationRequest,Abblix.Oidc.Server.Model.ClientRequest,Abblix.Utils.Result_Abblix.Oidc.Server.Model.BackChannelAuthenticationSuccess,Abblix.Oidc.Server.Common.OidcError_)}

Formats a back\-channel authentication response asynchronously\.

```csharp
System.Threading.Tasks.Task<Microsoft.AspNetCore.Mvc.ActionResult> FormatResponseAsync(Abblix.Oidc.Server.Model.BackChannelAuthenticationRequest request, Abblix.Oidc.Server.Model.ClientRequest clientRequest, Abblix.Utils.Result<Abblix.Oidc.Server.Model.BackChannelAuthenticationSuccess,Abblix.Oidc.Server.Common.OidcError> response);
```
#### Parameters

###### `request` [BackChannelAuthenticationRequest](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Model.BackChannelAuthenticationRequest 'Abblix\.Oidc\.Server\.Model\.BackChannelAuthenticationRequest') {#Abblix.Oidc.Server.Mvc.Formatters.Interfaces.IBackChannelAuthenticationResponseFormatter.FormatResponseAsync(Abblix.Oidc.Server.Model.BackChannelAuthenticationRequest,Abblix.Oidc.Server.Model.ClientRequest,Abblix.Utils.Result_Abblix.Oidc.Server.Model.BackChannelAuthenticationSuccess,Abblix.Oidc.Server.Common.OidcError_).request}

The back\-channel authentication request\.

###### `clientRequest` [ClientRequest](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Model.ClientRequest 'Abblix\.Oidc\.Server\.Model\.ClientRequest') {#Abblix.Oidc.Server.Mvc.Formatters.Interfaces.IBackChannelAuthenticationResponseFormatter.FormatResponseAsync(Abblix.Oidc.Server.Model.BackChannelAuthenticationRequest,Abblix.Oidc.Server.Model.ClientRequest,Abblix.Utils.Result_Abblix.Oidc.Server.Model.BackChannelAuthenticationSuccess,Abblix.Oidc.Server.Common.OidcError_).clientRequest}

The client request containing authentication details
            \(needed to determine the correct `WWW-Authenticate` scheme per RFC 6749 Section 5\.2\)\.

###### `response` [Abblix\.Utils\.Result&lt;](https://www.abblix.com/en/docs/api/abblix-utils/Abblix.Utils.Result_TSuccess_TFailure_ 'Abblix\.Utils\.Result\`2')[BackChannelAuthenticationSuccess](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Model.BackChannelAuthenticationSuccess 'Abblix\.Oidc\.Server\.Model\.BackChannelAuthenticationSuccess')[,](https://www.abblix.com/en/docs/api/abblix-utils/Abblix.Utils.Result_TSuccess_TFailure_ 'Abblix\.Utils\.Result\`2')[OidcError](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Common.OidcError 'Abblix\.Oidc\.Server\.Common\.OidcError')[&gt;](https://www.abblix.com/en/docs/api/abblix-utils/Abblix.Utils.Result_TSuccess_TFailure_ 'Abblix\.Utils\.Result\`2') {#Abblix.Oidc.Server.Mvc.Formatters.Interfaces.IBackChannelAuthenticationResponseFormatter.FormatResponseAsync(Abblix.Oidc.Server.Model.BackChannelAuthenticationRequest,Abblix.Oidc.Server.Model.ClientRequest,Abblix.Utils.Result_Abblix.Oidc.Server.Model.BackChannelAuthenticationSuccess,Abblix.Oidc.Server.Common.OidcError_).response}

The back\-channel authentication response result to be formatted\.

#### Returns
[System\.Threading\.Tasks\.Task&lt;](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1 'System\.Threading\.Tasks\.Task\`1')[Microsoft\.AspNetCore\.Mvc\.ActionResult](https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.actionresult 'Microsoft\.AspNetCore\.Mvc\.ActionResult')[&gt;](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1 'System\.Threading\.Tasks\.Task\`1')  
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, with the formatted response as an [Microsoft\.AspNetCore\.Mvc\.ActionResult](https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.actionresult 'Microsoft\.AspNetCore\.Mvc\.ActionResult')\.