Thanks for the reply
This is a crypto only payment processor they do not pay FIAT to the merchants.
What would be the challenges with paying FIAT on a daily basis to merchants?
(other then the obvious reason of absorbing the volatility risk and having a pool of FIAT)
The challenges would be mostly of legal nature.
Don't expect to start such a payment processor company without having atleast three lawyers who know the financial implications of bank and money regulations, on a global scale of course.
The IT-part is easy compared to that.