Go back to M70-201 - Magento Certified Developer Plus Exam

Question :-

Assume that PayPal has presented a new API for online purchasing that you are going to use. Which class should you extend for doing that?
Mage_Sales_Model_Quote_Payment
Mage_Payment_Model_lnfo
Mage_Payment_Model_Method_Abstract
Mage_Sales_Model_Order_Payment

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