How do Custom Authentication Module

Hi,

I am currently facing a problem that requires customization of SSO, but I am clueless about the Authentication modules in Designer and don't know how to create a custom authentication. Are there any resources available for me to learn from?

Our SSO involves storing a token in the customer's cookie for authentication. We use this token to query their API Server to verify the existence of the user. If the user exists, we can retrieve their name and allow them to log in.

Thank you,

Henry