MasterCard is a credit card network used by merchants to provide transaction capabilities for charges toMasterCard customers. The merchant pays a fee of typically between 10-50 cent plus about 2% of the tranaction.
Maestro is an ATM network that allows customers to withdraw money from their account. Maestro charges a fee to the customer for the withdrawal.
They can not be interchangeable. Credit card networks have the logo on the front of the card and ATM networks have the logo on the back of the credit card