Sr.Pago is a mobile point of sale (MPOS) system that enables individuals and small businesses to receive card payments via smartphones and tablets. It enables users to have access to banking-related services via a chip-based debit card, a card reader that connects to any smartphone or tablet, and an app for managing transactions. The MPOS system enables its users to accept credit card payment for the services they render, transfer that money to a reloadable MasterCard debit card, and make purchases with those funds anywhere MasterCard is accepted, and a withdraw cash from any Walmart-affiliated location in Mexico.