Choosing your first channel: ATM, POS or mobile app
All three channels use the same Adapter API, so the first one you choose does not lock you out of the others.
Start from the transactions your customers need most. Cash Out is card present only, so it needs an ATM or a POS machine. Name Inquiry, Wallet to Card and Card to Wallet are card not present only, so they belong in a mobile app.
Purchase, Bill Info, Save Payment, Card to Card, Cash In and Balance Inquiry are supported both ways, so they can be offered on whichever channel you launch first.
Because ATM, POS and mobile app all connect through the Baran Adapter API, adding a second channel later builds on the first integration.