It got me thinking, Amazon AWS has a Javascript SDK right that lets you use AWS directly from the browser...http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/index.html

How do you go about doing the same thing Parse is seemingly doing? Basically, capture email and password from a form and send it directly to Amazon?

It was really complicated seemed like I can only let user's login via Google, Amazon or Facebook. http://docs.aws.amazon.com/STS/latest/UsingSTS/CreatingWIF.html

What about supporting basic username/password combo without the need to go through a 3rd party authentication?

Also, what would you use to store the user data? Amazon S3? DynamoDB? SimpleDB?

Super lost as to how I can get this started. Basically, I want to host the static portions like html, css, javascript on S3 and handle the user authentication and interacting with storage via Amazon Javascript SDK.

Eventually I'd need to support Stripe as well. but I don't want to host it on my own server, it should be on Amazon or something.

Parse also seems to have something like this http://parse.com/docs/js/symbols/Stripe.Customers.html