Scalekit SSO is a single sign-on solution designed for B2B SaaS applications. The product enables developers to add enterprise SSO capabilities to their applications without replacing existing user management systems. It supports both SAML and OIDC authentication protocols and provides integration with major identity providers. The solution offers modular authentication that works alongside existing user systems without requiring migration. It includes support for IdP-initiated SSO login, allowing users to access applications directly from their identity provider. The platform automatically fetches and refreshes IdP certificates every 24 hours via metadata URL. Scalekit SSO provides REST APIs and SDKs for implementation, along with development environments for testing. The product includes authentication logs, webhooks for workflow implementation, and interceptors for extensibility. Organizations can customize login methods and SSO connections per their requirements. The platform is designed to integrate with existing authentication stacks and supports multi-tenant architectures. It includes UI widgets for customization and provides documentation, API references, and code samples for developers. The solution addresses enterprise authentication requirements for SaaS applications selling to business customers.