I integrated Spring Security, Spring Session with Redis, OAuth2 Login, Google reCaptcha v3, Docker for PostgreSQL and Redis...

To run the project you have to fill in the application.properties where the values are named YOUR_CLIENT_ID, YOUR_SECRET_HERE..., in the MailService class you have to fill in YOUR_EMAIL_HERE, in templates checkout.html and login.html need YOUR_SITE_KEY for reCaptcha, in static/js the files /login/login.js, /login/sign-up.js and checkout.js need YOUR_SITE_KEY for their calls to the reCaptcha API.