> The meeting was about an app that integrates credit card payments, billets and bank account on a terminal that is going to be available to the general public. > > The deadline? 11PM of the same day. Final version. From 0 to 100% in 6 hours.

That is not only impossible, it is reckless. A good way to lose not only money when things break, but get your access to credit cards and bank transactions eliminated when they learn their procedures were not covered.