Both Mastercard and Visa are credit card companies. They are engaged by numerous banks for their credit card services and products beacuse of their networks' global presence. Correct me if Im wrong, pero ang Visa merong debit card (Visa Electron) unlike Mastercard. Visa is also involved with the Plus ATM network. With regards to security, I think both are running under SSH2 (Triple DES encryption, a 24-bit 3-time data encrytion algo) so they are much secure. Both are currently implementing chip-based cards (EMV) for added security. Both earn their revenues when a merchant uses their networks for their credit card purchases. This amount (and other fees) is passed on to the customers. That's why in some cases, paying for an item using a credit card is higher than purchasing it in cash. It depends on whether the merchant is willing to absorb these costs.


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