---
title: IRegistrar interface
slug: commerce-connect-13/docs/iregistrar-interface
docTags: 
createdAt: 2026-07-23T09:44:50.000Z
---

The IRegistrar interface supports self-registered users who do not need back-end access functionality. A common use case for this is a user store for management functions of your site, and another user store for customers who buy goods from your ecommerce site.

The interface uses *EPiServer.ServiceLocation.ServiceLocator* to register the default instance of the interface. Then, in your front-end code, use the ServiceLocator instance when writing your controllers, so you can easily switch to a new IRegistrar user store in the future if needed.

:::hint{type="info"}
**Note**
This configuration requires the [EPiServer.Commerce.Security](https://nuget.episerver.com/en/OtherPages/Package/?packageId=EPiServer.Commerce.Security) NuGet package as dependency.
:::

## Interface methods

- `String AuthenticationType` – Sets OWIN Authentication Type.
- `IPrincipal CreateUser(string userName, string password, string email);` – Creates a user in the user store and returns a ClaimsPrincipal. The principal should contain the following claims for roles **Everyone** and **Registered**.
- `void DeleteUser(string userName);` – Deletes the user.
- `bool ChangePassword(string userName, string oldPassword, string newPassword)`; – Changes the user's password.
- `ClaimsIdentity CreateIdentity(string userName);` – Creates the ClaimsIdentity with the proper claims provided by the user store.
- `bool ValidateUser(string userName, string password);` – Validates the userName and password.
- `void SignIn(AuthenticationProperties properties, params ClaimsIdentity\[] identities);` – Calls in the controller when logging in a user; gets the OWIN context and signin with the Authentication property of the OwinContext.