How to securely authenticate cross-domains in an iframe (excluding third-party cookies)?
It implements a PHP / Vue.js based project that allows clients to embed our service in an iframe window.
The security of third party cookies, they have become increasingly restrictive in recent years. There was a problem with user authorization, especially in Safari.
How to provide information about an authorized user and enable its authentication on a service embedded in an iframe to ensure its security. And so that the user is still authenticated after reloading the page.