How to Use AWS Lambda Authorizer for Flexible and Scalable Web Service Authorization
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On one of the projects I worked on, there were 8 services that used Auth0 for front-end authentication and a rotated static token for back-end authentication. Despite this, the main authentication and authorization single sign-on (SSO) system was Microsoft Azure Active Directory (AD), which was used for accessing company email, the corporate VPN, AWS infrastructure, etc.