MARTA solution - SoftPoS terminal running on commercial-of-the-shelf android smartphones. A unique feature of App is a backup method of transferring transaction data without the Internet, even weak signal of the network or lack of money on the mobile account is enough to make a transaction. This feature was enabled by using Accessibility API, which enables to make USSD request and read the responses without the need to USSD requests to be typed by a user.
MARTA SoftPoS terminal accepts payments from contactless debit and credit cards.