# Login Mechanisms We support 2 login mechanisms outlined below. ### 1. Metafi Login The user can login via Metafi SDK with the supported SSO mechanisms. We currently support Google SSO login, and Passwordless email login - and we are working on adding more login methods. ### 2. Custom Authentication If your game already has its own login mechanism implemented, you can still use the Metafi SDK by making use of this option. You can choose to authenticate a user using any method of your choice, and pass in a unique UUID to the Metafi SDK, which will be associated with the user wallet permanently. ### Passwordless Login Both mechanisms employ a Passwordless Login Flow. This enables a better UX for the user, without compromising on security. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.usemeta.fi/start/about/concepts-overview/login-mechanisms.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.