Thank you for your questions and your interest!

1. After validating the idea, you will have an option to either share it (which makes it public), or save it to your profile (which makes is private, and no one except you can see it, even us). Also, one lesson I learned from my startups experience - idea doesn't matter, what matters is execution. After all, if you finish your product and publish it, technically anyone can steal your idea.

2. We are using Stripe for payments, so we don't see any card details you enter. But we will look into PayPal, and maybe implement it later.