Auth0 vs WooCommerce

We devised SwiftERM to generate additional income from existing consumers on ecommerce websites. Available for those using Shopify, Magento, Woocommerce or Opencart, it runs in alongside (not instead of) existing email marketing software like Mailchimp, Drupal or Emarsys. It is 100% automatic so needs zero additional staff. It uses predictive analytics to identify imminent consumer purchases. The average additional turnover achieved is 10.5%. It is the only software in the world authorised to send Trustpilot to send product ratings in outbound emails. Developers and ecommerce retailers are invited to try to it for free, to establish viability this predictive analytics system is. SwiftERM is a certified Microsoft Partner MPN ID 6197468.

Currently, Passport.js repo has 324 open issues, and Jared (the original author) seems to be the one doing most of the work. Also, given that the documentation is not proper. Is it worth using Passport.js?

As of now, StackShare shows it has 29 companies using it. How do you implement auth in your project or your company? Are there any good alternatives to Passport.js? Should I implement auth from scratch?

We are a small IT company that works mainly with ASP.NET and .NET Core; we are planning for a standard solution with the most important features of e-commerce, but with a fully customizable possibility. Even if there is no customizability, there should exist stable plugins for every added feature even if paid, like adding comments possibility for students...

The most important other thing is that we have solution based mainly on .NET in the backend and AngularJS or React in front, our choice should be based on the possibility of integration of the chosen e-commerce platform with our other software.

To resume, we need fully customizable features or existed stable plugins for a lot of features. We also want no problems in integrating two systems like the Appointment system and the e-commerce platform. Please help me. I'm new to this company, and I had them perform a study for different CMS solutions that exist and pre-built.