Ask HN: How Does Brex Startup Credit Card Work?

I am talking about this Brex company - https://brex.com

Few Questions:

1) If I purchase something using Brex card then money will be paid by Brex or by my bank?

2) How does the money settlement work between my company, bank, and Brex?

3) What is the eligibility criteria to issue the Brex credit card?