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

## PollModeGrantProcessor Class

Handles CIBA poll mode token retrieval at the token endpoint\.
In poll mode, clients repeatedly poll until authentication completes\.
Tokens are removed from storage immediately after retrieval to prevent duplicate issuance\.
Uses atomic try\-remove operation to prevent race conditions\.

```csharp
public class PollModeGrantProcessor : Abblix.Oidc.Server.Features.BackChannelAuthentication.Interfaces.IBackChannelGrantProcessor
```

Inheritance [System\.Object](https://learn.microsoft.com/en-us/dotnet/api/system.object 'System\.Object') → PollModeGrantProcessor

Implements [IBackChannelGrantProcessor](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.BackChannelAuthentication.Interfaces.IBackChannelGrantProcessor 'Abblix\.Oidc\.Server\.Features\.BackChannelAuthentication\.Interfaces\.IBackChannelGrantProcessor')
### Constructors

## PollModeGrantProcessor\(IBackChannelRequestStorage\) Constructor {#Abblix.Oidc.Server.Features.BackChannelAuthentication.GrantProcessors.PollModeGrantProcessor.PollModeGrantProcessor(Abblix.Oidc.Server.Features.BackChannelAuthentication.Interfaces.IBackChannelRequestStorage)}

Handles CIBA poll mode token retrieval at the token endpoint\.
In poll mode, clients repeatedly poll until authentication completes\.
Tokens are removed from storage immediately after retrieval to prevent duplicate issuance\.
Uses atomic try\-remove operation to prevent race conditions\.

```csharp
public PollModeGrantProcessor(Abblix.Oidc.Server.Features.BackChannelAuthentication.Interfaces.IBackChannelRequestStorage storage);
```
#### Parameters

###### `storage` [IBackChannelRequestStorage](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.BackChannelAuthentication.Interfaces.IBackChannelRequestStorage 'Abblix\.Oidc\.Server\.Features\.BackChannelAuthentication\.Interfaces\.IBackChannelRequestStorage') {#Abblix.Oidc.Server.Features.BackChannelAuthentication.GrantProcessors.PollModeGrantProcessor.PollModeGrantProcessor(Abblix.Oidc.Server.Features.BackChannelAuthentication.Interfaces.IBackChannelRequestStorage).storage}

Storage for backchannel authentication requests\.
### Methods

## PollModeGrantProcessor\.ProcessAuthenticatedRequestAsync\(string, BackChannelAuthenticationRequest\) Method {#Abblix.Oidc.Server.Features.BackChannelAuthentication.GrantProcessors.PollModeGrantProcessor.ProcessAuthenticatedRequestAsync(string,Abblix.Oidc.Server.Features.BackChannelAuthentication.BackChannelAuthenticationRequest)}

Atomically removes the authentication request from storage and returns its authorized grant\.
If a concurrent request already consumed the entry, returns an `invalid_grant` error
to prevent duplicate token issuance\.

```csharp
public System.Threading.Tasks.Task<Abblix.Utils.Result<Abblix.Oidc.Server.Endpoints.Token.Interfaces.AuthorizedGrant,Abblix.Oidc.Server.Common.OidcError>> ProcessAuthenticatedRequestAsync(string authenticationRequestId, Abblix.Oidc.Server.Features.BackChannelAuthentication.BackChannelAuthenticationRequest request);
```
#### Parameters

###### `authenticationRequestId` [System\.String](https://learn.microsoft.com/en-us/dotnet/api/system.string 'System\.String') {#Abblix.Oidc.Server.Features.BackChannelAuthentication.GrantProcessors.PollModeGrantProcessor.ProcessAuthenticatedRequestAsync(string,Abblix.Oidc.Server.Features.BackChannelAuthentication.BackChannelAuthenticationRequest).authenticationRequestId}

###### `request` [BackChannelAuthenticationRequest](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.BackChannelAuthentication.BackChannelAuthenticationRequest 'Abblix\.Oidc\.Server\.Features\.BackChannelAuthentication\.BackChannelAuthenticationRequest') {#Abblix.Oidc.Server.Features.BackChannelAuthentication.GrantProcessors.PollModeGrantProcessor.ProcessAuthenticatedRequestAsync(string,Abblix.Oidc.Server.Features.BackChannelAuthentication.BackChannelAuthenticationRequest).request}

Implements [ProcessAuthenticatedRequestAsync\(string, BackChannelAuthenticationRequest\)](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.BackChannelAuthentication.Interfaces.IBackChannelGrantProcessor#Abblix.Oidc.Server.Features.BackChannelAuthentication.Interfaces.IBackChannelGrantProcessor.ProcessAuthenticatedRequestAsync(string,Abblix.Oidc.Server.Features.BackChannelAuthentication.BackChannelAuthenticationRequest) 'Abblix\.Oidc\.Server\.Features\.BackChannelAuthentication\.Interfaces\.IBackChannelGrantProcessor\.ProcessAuthenticatedRequestAsync\(string, Abblix\.Oidc\.Server\.Features\.BackChannelAuthentication\.BackChannelAuthenticationRequest\)')

#### Returns
[System\.Threading\.Tasks\.Task&lt;](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1 'System\.Threading\.Tasks\.Task\`1')[Abblix\.Utils\.Result&lt;](https://learn.microsoft.com/en-us/dotnet/api/abblix.utils.result-2 'Abblix\.Utils\.Result\`2')[AuthorizedGrant](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Token.Interfaces.AuthorizedGrant 'Abblix\.Oidc\.Server\.Endpoints\.Token\.Interfaces\.AuthorizedGrant')[,](https://learn.microsoft.com/en-us/dotnet/api/abblix.utils.result-2 '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://learn.microsoft.com/en-us/dotnet/api/abblix.utils.result-2 'Abblix\.Utils\.Result\`2')[&gt;](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task-1 'System\.Threading\.Tasks\.Task\`1')

## PollModeGrantProcessor\.ValidateTokenEndpointAccess\(\) Method {#Abblix.Oidc.Server.Features.BackChannelAuthentication.GrantProcessors.PollModeGrantProcessor.ValidateTokenEndpointAccess()}

Poll mode clients are expected to poll the token endpoint, so this always returns `null` \(no error\)\.

```csharp
public Abblix.Oidc.Server.Common.OidcError? ValidateTokenEndpointAccess();
```

Implements [ValidateTokenEndpointAccess\(\)](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.BackChannelAuthentication.Interfaces.IBackChannelGrantProcessor#Abblix.Oidc.Server.Features.BackChannelAuthentication.Interfaces.IBackChannelGrantProcessor.ValidateTokenEndpointAccess() 'Abblix\.Oidc\.Server\.Features\.BackChannelAuthentication\.Interfaces\.IBackChannelGrantProcessor\.ValidateTokenEndpointAccess\(\)')

#### Returns
[OidcError](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Common.OidcError 'Abblix\.Oidc\.Server\.Common\.OidcError')