Credit card pin pad API abstraction

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I am working on a Android interface that manage creditcards payments.The android device have NFC, stripe and chip reader integrated. Right now I can read all the information to process the payment from the card using NFC API calls regardless the card was inserted on the chip reader or contactless method was used. My client want to verify the pin when the card has been inserted (using chip rather than NFC) and I found that the PIN verification method has the touch pin pad GUI abstracted, so I can not manage the buttons events myself. Is this the standard method or protocol or should I be able to manage myself?

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