@justinfox Sorry for your frustration. Here is an angular app blog post and the authentication flows.
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There are a few ways in which you can architect this to ensure the user/entity is authenticated and authorized (reader here) depending on the language and architecture used. The tutorials and guides cover a few different approaches.
https://fusionauth.io/learn/expert-advice/authentication/login-authentication-workflows/ offers a high-level overview as well.
Lastly, if you decide to use OAuth, you could consult our modern guide to OAuth for more information.
Awesome, glad that you got it working!