PaymentCardView.java

// Init
PaymentCardView paymentCard = (PaymentCardView) findViewById(R.id.creditCard);


// Options
paymentCard.setCardTitle("Pay Now"); // set from xml as well
paymentCard.setSubmitButtonText("Done"); // set from xml as well


// Callbacks
paymentCard.setOnPaymentCardEventListener(new PaymentCardView.OnPaymentCardEventListener() {
    @Override
    public void onCardDetailsSubmit(String month, String year, String cardNumber, String cvv) {

    }

    @Override
    public void onError(String error) {
        Toast.makeText(SampleActivity.this, error, Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onCancelClick() {

    }
});