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

## ServiceCollectionExtensions Class

Extension methods that register endpoint pipelines \(handler \+ validator \+ processor \+ per\-step
validators / fetchers / grant handlers\) for the OAuth 2\.0 / OpenID Connect endpoints exposed by
this library: configuration, authorization \(with PAR\), token, userinfo, revocation, introspection,
check\-session, end\-session, dynamic client management, CIBA backchannel and RFC 8628 device
authorization\. Use `TryAdd*` so that host pre\-registrations win\.

```csharp
public static class ServiceCollectionExtensions
```

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

## ServiceCollectionExtensions\.AddAuthorizationCodeGrant\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationCodeGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Registers the authorization code grant handler for OAuth 2\.0 authorization code flow\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddAuthorizationCodeGrant(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationCodeGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

## ServiceCollectionExtensions\.AddAuthorizationContextValidators\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationContextValidators(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Adds a series of validators for authorization context as a composite service to ensure comprehensive validation
of authorization requests\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddAuthorizationContextValidators(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationContextValidators(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

### Remarks
This method composes a pipeline of validators for various aspects of the authorization context,
such as request object validation, client validation, and more\.
This composite validator approach enables modular and extensible validation logic, ensuring that
authorization requests meet all necessary criteria and standards\.

## ServiceCollectionExtensions\.AddAuthorizationEndpoint\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Adds services and processors for handling authorization requests to the service collection\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddAuthorizationEndpoint(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

### Remarks
This setup is crucial for supporting the OAuth 2\.0 and OpenID Connect authorization flow,
ensuring that incoming authorization requests are correctly validated and processed\.

## ServiceCollectionExtensions\.AddAuthorizationGrant\<TImpl\>\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationGrant_TImpl_(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Registers [TImpl](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationGrant_TImpl_(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).TImpl 'Abblix\.Oidc\.Server\.Endpoints\.ServiceCollectionExtensions\.AddAuthorizationGrant\<TImpl\>\(this Microsoft\.Extensions\.DependencyInjection\.IServiceCollection\)\.TImpl') as both [IAuthorizationGrantHandler](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Token.Grants.IAuthorizationGrantHandler 'Abblix\.Oidc\.Server\.Endpoints\.Token\.Grants\.IAuthorizationGrantHandler')
\(for grant\-handling dispatch via [CompositeAuthorizationGrantHandler](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Token.Grants.CompositeAuthorizationGrantHandler 'Abblix\.Oidc\.Server\.Endpoints\.Token\.Grants\.CompositeAuthorizationGrantHandler')\) and
[IGrantTypeInformer](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Common.Interfaces.IGrantTypeInformer 'Abblix\.Oidc\.Server\.Common\.Interfaces\.IGrantTypeInformer') \(for discovery and registration\-time gates that
aggregate the full `grant_types_supported` set across all informers\)\. Every
[IAuthorizationGrantHandler](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Token.Grants.IAuthorizationGrantHandler 'Abblix\.Oidc\.Server\.Endpoints\.Token\.Grants\.IAuthorizationGrantHandler') implementation, both built\-in and host\-supplied,
must be registered through this helper so the dual\-presence invariant cannot be silently
missed when a new grant handler is added\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddAuthorizationGrant<TImpl>(this Microsoft.Extensions.DependencyInjection.IServiceCollection services)
    where TImpl : class, Abblix.Oidc.Server.Endpoints.Token.Grants.IAuthorizationGrantHandler;
```
#### Type parameters

###### `TImpl` {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationGrant_TImpl_(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).TImpl}

The concrete grant\-handler implementation to register\.
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationGrant_TImpl_(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

## ServiceCollectionExtensions\.AddAuthorizationGrants\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationGrants(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Composes all registered authorization grant handlers into a composite handler and registers it as the grant type informer\.
This method should be called after all individual grant handlers have been registered\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddAuthorizationGrants(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationGrants(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

## ServiceCollectionExtensions\.AddAuthorizationRequestFetchers\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationRequestFetchers(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Registers authorization request fetchers and related services into the provided IServiceCollection\.
This method adds implementations for various authorization request fetchers as singletons, ensuring
that they are efficiently reused throughout the application\. It also composes these fetchers into a
composite fetcher to handle different types of authorization requests seamlessly\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddAuthorizationRequestFetchers(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationRequestFetchers(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The IServiceCollection to which the services will be added\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The updated IServiceCollection with the added authorization request fetchers\.

## ServiceCollectionExtensions\.AddAuthorizationResponseProcessor\<TImpl\>\(this IServiceCollection, ServiceLifetime\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationResponseProcessor_TImpl_(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection,Microsoft.Extensions.DependencyInjection.ServiceLifetime)}

Registers [TImpl](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationResponseProcessor_TImpl_(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection,Microsoft.Extensions.DependencyInjection.ServiceLifetime).TImpl 'Abblix\.Oidc\.Server\.Endpoints\.ServiceCollectionExtensions\.AddAuthorizationResponseProcessor\<TImpl\>\(this Microsoft\.Extensions\.DependencyInjection\.IServiceCollection, Microsoft\.Extensions\.DependencyInjection\.ServiceLifetime\)\.TImpl') as a Singleton concrete service and aliases the
SAME instance under both [IAuthorizationResponseBuilder](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Authorization.Interfaces.IAuthorizationResponseBuilder 'Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Interfaces\.IAuthorizationResponseBuilder') \(for response\-type
dispatch in the authorization endpoint\) and [IGrantTypeInformer](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Common.Interfaces.IGrantTypeInformer 'Abblix\.Oidc\.Server\.Common\.Interfaces\.IGrantTypeInformer') \(for
discovery and registration\-time gates that aggregate `grant_types_supported`\)\.
Every [IAuthorizationResponseBuilder](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Endpoints.Authorization.Interfaces.IAuthorizationResponseBuilder 'Abblix\.Oidc\.Server\.Endpoints\.Authorization\.Interfaces\.IAuthorizationResponseBuilder') implementation must be registered
through this helper so each processor's declared grant type lands in the
[IGrantTypeInformer](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Common.Interfaces.IGrantTypeInformer 'Abblix\.Oidc\.Server\.Common\.Interfaces\.IGrantTypeInformer') chain without an extra registration step\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddAuthorizationResponseProcessor<TImpl>(this Microsoft.Extensions.DependencyInjection.IServiceCollection services, Microsoft.Extensions.DependencyInjection.ServiceLifetime lifetime=Microsoft.Extensions.DependencyInjection.ServiceLifetime.Singleton)
    where TImpl : class, Abblix.Oidc.Server.Endpoints.Authorization.Interfaces.IAuthorizationResponseBuilder;
```
#### Type parameters

###### `TImpl` {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationResponseProcessor_TImpl_(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection,Microsoft.Extensions.DependencyInjection.ServiceLifetime).TImpl}

The concrete response\-builder implementation to register\.
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationResponseProcessor_TImpl_(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection,Microsoft.Extensions.DependencyInjection.ServiceLifetime).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

###### `lifetime` [Microsoft\.Extensions\.DependencyInjection\.ServiceLifetime](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.servicelifetime 'Microsoft\.Extensions\.DependencyInjection\.ServiceLifetime') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddAuthorizationResponseProcessor_TImpl_(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection,Microsoft.Extensions.DependencyInjection.ServiceLifetime).lifetime}

The service lifetime for the processor and its aliases; defaults to
            [Microsoft\.Extensions\.DependencyInjection\.ServiceLifetime\.Singleton](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.servicelifetime.singleton 'Microsoft\.Extensions\.DependencyInjection\.ServiceLifetime\.Singleton')\. Use [Microsoft\.Extensions\.DependencyInjection\.ServiceLifetime\.Scoped](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.servicelifetime.scoped 'Microsoft\.Extensions\.DependencyInjection\.ServiceLifetime\.Scoped') when the
            processor has scoped dependencies, to avoid a captive dependency\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

## ServiceCollectionExtensions\.AddBackChannelAuthenticationContextValidators\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddBackChannelAuthenticationContextValidators(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Configures and registers a composite of back\-channel authentication context validators
into the service collection\. Validators run in sequence to verify the client, the
requested resources and scopes, the user identity hint, the requested expiry, the user
code, and the ping\-mode configuration before a CIBA request is accepted\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddBackChannelAuthenticationContextValidators(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddBackChannelAuthenticationContextValidators(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The service collection to which the back\-channel authentication context validators will be added\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The modified service collection with the registered back\-channel authentication context validators\.

## ServiceCollectionExtensions\.AddClientCredentialsGrant\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddClientCredentialsGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Registers the client credentials grant handler for OAuth 2\.0 client credentials flow\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddClientCredentialsGrant(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddClientCredentialsGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

## ServiceCollectionExtensions\.AddConfigurationEndpoint\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddConfigurationEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Adds the configuration handler for OpenID Connect Discovery endpoint\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddConfigurationEndpoint(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddConfigurationEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

### Remarks
This handler builds discovery metadata according to OpenID Connect Discovery specification,
providing framework\-agnostic metadata about the provider's configuration\.

## ServiceCollectionExtensions\.AddDeviceAuthorizationContextValidators\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddDeviceAuthorizationContextValidators(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Configures and registers a composite of device authorization context validators into the
service collection\. Validators run in sequence to verify the client, the requested scopes,
and the requested resources before a device authorization request \(RFC 8628\) is accepted\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddDeviceAuthorizationContextValidators(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddDeviceAuthorizationContextValidators(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The service collection to which the device authorization context validators will be added\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The modified service collection with the registered device authorization context validators\.

## ServiceCollectionExtensions\.AddEndSessionContextValidators\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddEndSessionContextValidators(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Configures and registers a composite of end\-session context validators into the service
collection\. Validators run in sequence to verify the `id_token_hint`, the client,
the post\-logout redirect URI, and the confirmation claim before an end\-session request
is accepted\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddEndSessionContextValidators(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddEndSessionContextValidators(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The service collection to which the end\-session context validators will be added\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The modified service collection with the registered end\-session context validators\.

## ServiceCollectionExtensions\.AddEndSessionEndpoint\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddEndSessionEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Adds services for handling end session \(logout\) requests aligning with OpenID Connect session management
specifications\. This setup enables the application to handle logout requests effectively, ensuring that
user sessions are terminated securely across all involved parties\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddEndSessionEndpoint(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddEndSessionEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

## ServiceCollectionExtensions\.AddJwtBearerGrant\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddJwtBearerGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Registers services required for JWT Bearer grant type, including JWT Bearer issuer provider,
JWT replay prevention cache, and keyed caching decorator for JWKS fetching\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddJwtBearerGrant(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddJwtBearerGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

## ServiceCollectionExtensions\.AddPushedAuthorizationEndpoint\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddPushedAuthorizationEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Registers validators and processors for pushed authorization requests \(PAR\), enhancing the security and
efficiency of the authorization process by allowing clients to send requests directly to
the authorization server via a back\-channel connection\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddPushedAuthorizationEndpoint(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddPushedAuthorizationEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

## ServiceCollectionExtensions\.AddRefreshTokenGrant\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddRefreshTokenGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Registers the refresh token grant handler for OAuth 2\.0 refresh token flow\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddRefreshTokenGrant(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddRefreshTokenGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

## ServiceCollectionExtensions\.AddTokenContextValidators\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddTokenContextValidators(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Configures and registers a composite of token context validators into the service collection\.
This method sets up a sequence of validators that perform various checks on token requests,
ensuring they comply with the necessary criteria before a token can be issued\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddTokenContextValidators(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddTokenContextValidators(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The service collection to which the token context validators will be added\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The modified service collection with the registered token context validators\.

## ServiceCollectionExtensions\.AddTokenEndpoint\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddTokenEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Adds services for validating and processing token requests according to OAuth 2\.0 and OpenID Connect
standards\. This setup supports various grant types, ensuring that token requests are handled securely and
efficiently, facilitating the issuance of access tokens, refresh tokens, and ID tokens to clients\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddTokenEndpoint(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddTokenEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

## ServiceCollectionExtensions\.AddTokenExchangeGrant\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddTokenExchangeGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Registers the RFC 8693 Token Exchange grant handler together with the per\-type
[ISubjectTokenResolver](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.TokenExchange.ISubjectTokenResolver 'Abblix\.Oidc\.Server\.Features\.TokenExchange\.ISubjectTokenResolver') implementations the library
ships natively \(JWT\-formatted subject tokens via [JwtSubjectTokenResolver](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.TokenExchange.JwtSubjectTokenResolver 'Abblix\.Oidc\.Server\.Features\.TokenExchange\.JwtSubjectTokenResolver')
for the `access_token`/`id_token`/`jwt` type URIs, and
[RefreshTokenSubjectTokenResolver](https://www.abblix.com/en/docs/api/abblix-oidc-server/Abblix.Oidc.Server.Features.TokenExchange.RefreshTokenSubjectTokenResolver 'Abblix\.Oidc\.Server\.Features\.TokenExchange\.RefreshTokenSubjectTokenResolver') for refresh tokens\)\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddTokenExchangeGrant(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddTokenExchangeGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')\.

### Remarks
Subject\-token resolvers are dispatched by keyed DI under the
`urn:ietf:params:oauth:token-type:*` URI\. Hosts may register additional resolvers
after this call \(e\.g\. SAML 2\.0 assertions in federation scenarios\) \-\- the handler picks
them up automatically\. The `actor_token`/delegation path and discovery / DCR
metadata land in subsequent slices \(see \#143\)\.

## ServiceCollectionExtensions\.AddUserInfoEndpoint\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddUserInfoEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Adds services for handling user info requests, allowing clients to retrieve claims about the authenticated user
in accordance with OpenID Connect standards\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddUserInfoEndpoint(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.AddUserInfoEndpoint(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to configure with user info endpoint capabilities\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The configured [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection'), allowing for further service registration chaining\.

### Remarks
Registers scoped validators and processors for user info requests, enabling the secure delivery of claims
about the authenticated session user to the client\. This functionality is crucial for OpenID Connect\-compliant
applications, providing a standardized method for clients to access user profile information based on the scopes
and permissions granted during authentication\. The service setup ensures that user info requests are properly
validated and processed, safeguarding sensitive user information while supporting rich client applications\.

## ServiceCollectionExtensions\.EnablePasswordGrant\(this IServiceCollection\) Method {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.EnablePasswordGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection)}

Enables support for the password grant type, acknowledging its security considerations\.

```csharp
public static Microsoft.Extensions.DependencyInjection.IServiceCollection EnablePasswordGrant(this Microsoft.Extensions.DependencyInjection.IServiceCollection services);
```
#### Parameters

###### `services` [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') {#Abblix.Oidc.Server.Endpoints.ServiceCollectionExtensions.EnablePasswordGrant(thisMicrosoft.Extensions.DependencyInjection.IServiceCollection).services}

The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') to add the password grant handler to\.

#### Returns
[Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection')  
The [Microsoft\.Extensions\.DependencyInjection\.IServiceCollection](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.iservicecollection 'Microsoft\.Extensions\.DependencyInjection\.IServiceCollection') so additional calls can be chained\.

### Remarks
This method is intentionally separated from the standard OIDC core service registration due to the inherent
security risks associated with the password grant type\. The password grant type requires the client to handle
user credentials directly, which can increase the risk of credential exposure and related security issues\.
By isolating this method, we ensure that developers make a deliberate decision to enable this feature, being
fully aware of its security implications\. It's recommended to use more secure grant types like authorization
code or client credentials whenever possible\. Call this before `AddOidcCore`/`AddOidcServices`:
the password grant handler must be registered before the grant handlers are composed, otherwise the
registration is rejected at startup\.