For Shopify Plus stores
niccos-oidc is an OpenID Connect identity provider that Shopify customer accounts connect to. Customers sign in on your branded login page with a one-time email code, a password, or your company's identity provider, and Shopify receives a verified email address.
Requires Shopify Plus: Shopify only lets Plus stores connect their own identity provider. Development stores can install the app to configure it and preview the login page.